Malicious PDF — malware analysis report

Static analysis result for SHA-256 a312b1cff1becdf9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 04:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 582e56c3a31b1e74b96f28c0cbe745c5 SHA-1: 7f74b553c1d6e87593fe82535cadba6f67bb4ff0 SHA-256: a312b1cff1becdf927b5332006404af3a59fd97fec9f239a5242d5aac4930d29
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 to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The primary function appears to be directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m0amcnhuieav703u32g075kmji/76523302865.pdf In PDF document text
    • https://jiu-hang.com/upfiles/editor/files/64468730490.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/gakije.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mazubuvugafunilinolagebo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a899d1a2b66---49049826481.pdfIn PDF document text
    • http://ropesadventure.com/d/files/73384515860.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/nokosobowazegurep.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/87736263852.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce3fffa1e94eb4ec6c60358ad0162e14/41876934613.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/vinajeladubanuwe.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/99526110870.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3551d26afb95c70f72e3c049677cd6e3/59214645683.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1knmirdmsv10suvn45137h4e26/73247818640.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/sibidovifazepadebomiwasu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b6e40f73---ridagiwipagivuwadini.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6b043a12d---vonokizuke.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/74814369697.pdfIn PDF document text
    • https://sce.tw/uploads/files/60faeb7cc0643.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/luwiremiwajilituteriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=as+if+as+thoughPDF 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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18504 bytes
SHA-256: 1a76367ebbfa685071dac85ff6236bc2e03df5cfd537ddfc4e4e1dd6ef43ab38
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 10192 bytes
SHA-256: 686c95af2b1ac3a9668f49d8fb010ee919c94e8d9acc64411fa5b42bfd5e34ad