Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ca470ce1538483…

MALICIOUS

PDF

91.8 KB Created: 2021-07-14 04:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2f939ae8ddc0f434cbb7db46a3ef50c SHA-1: 39fe1be9ad02cba04fe392d85a210924589b1fac SHA-256: c5ca470ce153848361a197a28ecd58ca08f62665ff02315afab1bab4b9fe910f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pattern, though the document body itself is unreadable, preventing a more specific analysis of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahkjt.com/upfile/file/zonibumifogela.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/07ed7866e310fd7149b290634663456d/buzokogudijudamitegokero.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/13196759518.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8vsnhl8emvfkag6i5qgvs8tjv2/89219625778.pdf
    • http://ndt-ultratech.com/files/53716896913.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dee4977ad5d---69442898505.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b630627db---54615069073.pdf
    • http://e-skala.pl/userfiles/file/2768394388.pdf
    • http://www.css-jp.com/upfile/files/2021/06/20/25069669220.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87dd68b5bf---fugelavo.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3ada2bf3d10fd3327ab0c5e7ecd655ad/nizisarenagamo.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/19830363571.pdf
    • http://asiavent.com/UserFiles/file///xejumoxikupa.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251ec4c2fd---kojogofexuboxafuwerazaxa.pdf
    • http://standdominica.org/files/files/39407162886.pdf
    • https://webmenuplus.com/images/file/13258056221.pdf
    • https://isosklo.cz/uploads/devovakigononu.pdf
    • https://mebelihome.ru/upload_picture/1511756352.pdf
    • http://singer-island-condos.com/userfiles/files/21285193579.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/464bb823bfb4396ff6e9f5c99113d099/lelusitudela.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/4ljj9ar9k3vp3mhqnfq4pc5ddq/vavonodob.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95795781867.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/99035680fce0c784e1713542f4dc0f55/75093241870.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf0f95d3b9---61898517679.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8da3aac5e5c2aa4b0f50a5327266ab33/xedexigo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=double+pocket+watch+tattoo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010589.bin
2a540b20284897f49a6c57710eb9951957dcae31a5e07584fd621c2e0e200f85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 10424 bytes
font_01_sfnt_off00011d2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 16792 bytes
font_02_sfnt_off00013540.bin
6e4d212a32d99f0faa2c04e3b7bb88c9fd75aa337efe4ce342378dd20a4108e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 16852 bytes