Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee18ddc5d17efd2…

MALICIOUS

PDF

90.5 KB Created: 2021-07-08 02:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a07fe1ed016b3be16e9c26e7efd2452 SHA-1: b093116d96a39e6f69a571ca72bd07aa854f4f08 SHA-256: cee18ddc5d17efd249bc1efc6144f167484c201d5b99d50806a38a1ee287b5b6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a download button lure and callback phishing pretext suggests a social engineering attempt to trick the user into downloading a malicious payload. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting further support a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b1cd75a9931eab254fda952c0c6a7aa6/refogaboxizezopadabexo.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/5257961497.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/rorifovagidafiluxalodali.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae591bef28---50875493332.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2c0bb3a8eac6878b0f13b1c1caeef44b/joxifigojisufafu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85cda77a6---zojaraloxegajasadi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b34345e8b084bf21b50cda9d11cae3d3/60800451854.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b5ecbe1be---gitasodopujubirid.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a3480d8d523e7c7adf70431360be97ea/nerisabokunomojala.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a3c2b3cc---vevabumulisorivuvisabi.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/vapasekivadipivefezu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/49031ffc9568d81097e58ef5f79bdaf0/paguwo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/87714158e70c65296ecf3b612550273a/walivoxatavanowa.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503005133614742.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/57697466884.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/52341894680.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/91943170603.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c725593f0cc---10987545211.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa444a1cf6---xupifevodelidotigigu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f671d62a---rijubisuzifuwipewog.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae4164b3c---39126560939.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/dizenoredixijaxogum.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jefibipot.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b2f5968f7---menebupevunanemi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a2521cd6142ebb7430f554b1d7704814/41994813489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pages+user+guide+for+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10736 bytes
SHA-256: a7758714393b7ea6fab517225f92f3cefd7ed81fec0e034cfb88e94bee993f08
font_01_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 17388 bytes
SHA-256: 8e09cbeb7fcd3067d8959aef4d937e56076d4999e7839eaec4b7d9bfdc92b21d
font_02_sfnt_off000144a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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