Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6d5640b8e7e4f4…

MALICIOUS

PDF

87.4 KB Created: 2021-08-13 14:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a230ce00f9ab3de73aee0d192dd52fa SHA-1: 380b597435aa59532c299e5c0f8da28c0743aa8a SHA-256: cc6d5640b8e7e4f48f129f6ceb959b06d99f450e06b2e09752f80603f8284b82
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicative of a link farm used for phishing or scam campaigns. The presence of a callback lure heuristic suggests the document may prompt users to call a fraudulent support number. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent, likely related to credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://fzcce.com/aimgs/uload/files/mukiwiwawarakol.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/59297df693385ba48f3fe03a207c0f0c/47918612360.pdf
    • http://angerdress.store/ckfinder/userfiles/files/69863552806.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/84169960de728bf9f12755ddf79ef151/sojaviro.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/nuzuzij.pdf
    • https://senhewood.com/d/files/92885024087.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b2684d5e---77123806669.pdf
    • http://www.netcorp.hu/data/editorfile/58648022228.pdf
    • https://tomas-music.com/contents//files/16977687936.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc7f31f67---setisoli.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a1a4a9bb502a4ab7368fdd239543e805/7969598587.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/78777302800.pdf
    • https://paidionresearch.com/userfiles/files/93818372793.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608162c63b08b---suregavir.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cc8a3af5caf8586750435abf2b400b6a/musesosobadoj.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd23d707223---muvumodulaxopubibuxo.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/wozuxofofoxigetesekid.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/xamobepadubidel.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0c486560---2717094851.pdf
    • http://badaranquehablar.com/userfiles/files/fedisomubobipaxemi.pdf
    • https://healthmatters.me/userfiles/file/20771965598.pdf
    • https://zivotzaokny.eu/res/file/75326362757.pdf
    • https://kientrucqhouse.com/uploads/image/files/41918762909.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r1g379u3ti9luk33a3rjkkphmh/mubativefebupizij.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d4b48fdca985fe4f6b128383a26f3ed0/40266907529.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60dc15a38---leworolexugomato.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/xaxofazolusebigasigika.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+felony+domestic+violence+in+florida
    • 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_off0000efe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 16792 bytes
font_01_sfnt_off000107f5.bin
432da03ca9a26c072919f88c93fa2e9f32817e15af04b8cfe15940312c4de5e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 17616 bytes
font_02_sfnt_off00013459.bin
b36d492572cfbcc6ec20a9f94e732d74dd49e99d03ffe605994d23fb4c4488e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10912 bytes