Malicious PDF — malware analysis report

Static analysis result for SHA-256 643cf4191aa57ae5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 01:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ae985c545373eb084e67124b6e099dc SHA-1: 3fd8fd72624193c2835a169798b4c8b31f6c12cd SHA-256: 643cf4191aa57ae5d627348fc5964860babffcf828f21a8e88aeba704ccf3ffa
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://j1ent.com/userfiles/file/20210910004626.pdf In PDF document text
    • http://domainecomps.com/documents/files/gogorozubud.pdfIn PDF document text
    • http://agmapure.com/upload/files/jixovewogovupeguranu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6e5e3620770a353696c01b1e35011990/38932995164.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/munonitabimuzi.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/71740371271.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/17168706464.pdfIn PDF document text
    • http://sushi-belovo.ru/files/93321239571.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613816ab304d3---donigododitoxobunapebez.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5062aeb89cc0f46a9b6ec9a2fece6141/gawimolejolazosusinadof.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxemapopib.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/sagamo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/h07sp3jvgd75cid74t7q7tfuk6/velibaz.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/95095230875.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/74260303837.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/dulilepabibelajogitaru.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/raludaloladimisilan.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/70vdsb8t7fp7mtogojgmh7a8q8/45170063734.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/sajabunijuw.pdfIn PDF document text
    • http://vejwun.cz/images/77433517644.pdfIn PDF document text
    • http://iltorg.ru/upload/file/wavofik.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/68382077914.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109080932489696.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161305a65ae58d---zotovutexuzivivipotale.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/tigutosepukefutaxili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=miui+12+android+system+battery+drainPDF 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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10884 bytes
SHA-256: 724140dbe8491eb5e994a2cfe74ecdffaac5386c2399f7a9bb56a5207e37cb94
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 18204 bytes
SHA-256: b2e90d514acaef5c5e861dae81b335dd3ba3dbc5909b59b5e83f854b6ab7ce65