Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a33ce08eaec3463…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 07:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 530de7c4f6b430378a0bad3ec76f3773 SHA-1: 46efd73ef0a97e2a4763439856e3bdde4facef9d SHA-256: 2a33ce08eaec3463636b09f14c7468a10ba21a48e94d2422a80d80a50c964000
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised or disposable hosting sites, suggesting it is part of a link farm designed to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive users into contacting an attacker, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://spielundlicht.de/content_provider/documents/files/42887062669.pdf In PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198210416988.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92571361389.pdfIn PDF document text
    • http://ellev.fr/upload/files/werew.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/nupurudazipizitumoxotup.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/57008877902.pdfIn PDF document text
    • http://telecycling.info/files/file/23531708624.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/moromujuw.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/93753196824.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/87832ec10058315dd97effdd9040798c/mefobukonojer.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/duzukigo.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/modima.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/51154931813.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/53289102614.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/61629852557.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kataz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf928999b---sobitulegoreke.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/gedexefedetaxuge.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379de9decd2---nerekavuvisenovekopud.pdfIn PDF document text
    • http://djpress.pl/Image/files/jujasopidizak.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161461ae2a4ef4---libopitotajun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+11+pro+vs+s10PDF 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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 10140 bytes
SHA-256: 0499096c56593f3a290db98b2df91ebfef5bd47103bc4c04e4d969b9f8d4d546
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 19580 bytes
SHA-256: 09697c318ec81612a382ee40c14271bc3a2b2af005a5ccb1552bdae0114e7f2b

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