Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c933d1f9e44688…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 08:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 237c1fe9115d0b0df173be40981016b2 SHA-1: 2c9e0f9783da6c2a3e04748413c8d185cf12f4a7 SHA-256: 84c933d1f9e446882b77e3435ebbccbf59e46aefdc0c5e2b71457b2cd4baeea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=life+in+the+uk+test+study+guide+pdf PDF link annotation
    • https://infiniteprospects.com/FCKeditor/file/gadogo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/kowizerakura.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/13196364555.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/97425575566.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/54275255935.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zadinapurolobudakotesozo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/jukokaje.pdfIn PDF document text
    • http://land89.com/ckupload/files/52367999491.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0df8aa65732a08ac155297d3e7341b5c/fulafukojewixagoko.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/vejuri.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/sopubuguduzitut.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73020714a868fb06fbef4ccbd1a62507/98770422146.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/74161916247.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/lutolekipiwafovubijavi.pdfIn PDF document text
    • http://chayka-svg.ru/files/wumizidaxu.pdfIn PDF document text
    • https://mcdpiti.com/userfiles/files/mozudupuzonazix.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d63789e7f---mubim.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/35861781148.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/56687532439.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16129ed55a49ac---sowemolurifadujojefanip.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ju3kiorlkvj5u85lg72cb0fau0/19534065607.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vawadimupe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d290f306d4---61459578854.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611027109bdbe---78310992391.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0iribm8fdpo3ch7a02lnq3rh54/49752635880.pdfIn PDF document text
    • 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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 17684 bytes
SHA-256: d30b9f6db5c9651eead3662e8d9c61c89cbb325ef92fc48cabd6f956f675582b
font_02_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 10612 bytes
SHA-256: 50c7b30e0417d4cbbca7d5304dd6fa044608d6d888e25f1fdb7b5744f8ea5e9b

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