Malicious PDF — malware analysis report

Static analysis result for SHA-256 f122a17553ef6922…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 15:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f7b4e4bb58b47bf62e41c84e1d97f2e SHA-1: 71db7bd8167e0cc1868a212470c5dd1af2ef6fd3 SHA-256: f122a17553ef69222cc3b81df9e7117dd2c322d2743e3f1b198a5d19baa0843d
184 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of a 'download button' lure and callback phishing indicators further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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) or Microsoft license-boilerplate 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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/r6bfjd63g3rbgvl7qkq43502t4/21906430801.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/6125525819.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bpgbll18pvltsb1vooa4f2njr9/vuvov.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce332acd2c6---24535157954.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ffe21235---luxiketijanotijaluvi.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/77459357324.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e352b287d4---40814157247.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0dc123ef---sudiwone.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/87363050490.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0d80907---34975545155.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/wufosokipusato.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/ludif.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e600794c2---vasolikuseriw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a799416d.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8586e6ab87c5a4962dc662e2096f11a3/tazowojelodorili.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ff19d846e5ecbc4ce095c6a8c1000498/43219130864.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/94650516665.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/dejesafonarunisezol.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lisowilopokowezi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/zixupujokerolija.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1768eeaea6ffbc7c69fe17633bc9fee5/64923672633.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062313143570554.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/rokodazuwolagomoz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071295059bbb---94949823389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fine+for+driving+in+a+bus+lanePDF 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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10712 bytes
SHA-256: 5b64faa5023672ae0c431046138e3c9099d88001fecf5702f140bb2f4f45b43d
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 17304 bytes
SHA-256: 86f7d00c2d1b43a8e03d5e9e9daf41d68a4cc904f695aab5da925a2a7352faf2