Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2818d0b4790ea9…

MALICIOUS

PDF

90.9 KB Created: 2021-08-03 13:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f19a7c4ab7d8d880c29bded13b38881 SHA-1: b8fc9f129cdf4c2a819263bf9ab3b4ffc4f6c713 SHA-256: cb2818d0b4790ea9a3ad550819afe38d712dc49f7db58f07fa98e825366d9619
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign. The document body, though heavily obfuscated, contains elements consistent with invoice or payment lures, and the presence of numerous external links indicates an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181ac9429d---81123375551.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210701/file/16251356307159.pdfIn PDF document text
    • https://ntc-container.com/upload/files/gaxap.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/83798355663.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9fb46fc389372b7a1fbd233977e4e2a4/zasowezilo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d4084a3a---55582635824.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wubudaxevesiwofofevoxif.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d2f2611---96162636667.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b671cca58f0---69810117376.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/85027116745.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/86715648405.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/61932781563.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/zekofoz.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/16234434617.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vhvlbpcoq9hrk689533j8qa806/36354768086.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a3e0cce8f0b96460ce5054366b594aaf/33775905757.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2106a35b28242a571f5fa2630f076c2c/pesojilotigomaj.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/38734713020.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429120016777564.pdfIn PDF document text
    • https://maturana.cl/upload/file/maduketewaxomijovevufowuv.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/33195831456.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/29817277249.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607881827db2a---mozufekug.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a95f760f2---fazuzawegizamoxebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+a+letter+asking+for+medical+financial+assistancePDF 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_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 17628 bytes
SHA-256: a8b9146aaf8b253e548d83f840e3e08080478cd09568377ea55c0996d0771dad
font_01_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 10988 bytes
SHA-256: f260569c42bb4fc7e80bcb6f79735fe9b2ce244a2b344d719a066b414a6c79f2

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