Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ccf96bb10447cb…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 13:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c1a4a981ef8918c86fa2479491e1ba7 SHA-1: 262c546bff3a8037bc2858c8c097e9ffb556f821 SHA-256: 44ccf96bb10447cb2f4e555986e6318a7ce8677e1267799bfe76c1c211861593
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest a tactic of distributing further malware through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134903197015---854358287.pdf In PDF document text
    • http://czerwoneiczarne.pl/files/file/42004258231.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/020c2538e8b5cd2c1786b7b1fdc7a40f/70329620438.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109040257444687.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/39234938215.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cd9c7c9e8c5157f1eb8699a613cbcd42/rexesofejavabaxuzu.pdfIn PDF document text
    • http://geoman.cz/data/file/683219742.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baa3f1b7c8c776eea43036c0b02ddf31/lalosodiguluguvibuv.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/zupopexexoxigorapifomeju.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/nikukobuzumoves.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rewujepakegolam.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdfIn PDF document text
    • http://cityfate.com/files/files/69469032406.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/ravunizoti.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/4438515382.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/12055782679.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070427362747.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/powogovoxevupupoxul.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/93363785780.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/8329477548.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/13207668795.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xivapujo.pdfIn PDF document text
    • http://xhzhengli.com/upload/liririjisenikoser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=windows+7+starter+snpc+oa+downloadPDF 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_off0000b129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 10636 bytes
SHA-256: a707f68fad7f48d864174c548f90bf2f0bda6ae76f2931bf42b5ffbd8a67eab3
font_02_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 14784 bytes
SHA-256: 99d20d2e61553eeb8615be8b2369e9c42d965a2a311731fd05bf0a884e0158d5