Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7fc7e9f7e59b4d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bb364c8d3460ab59414a6c62f67e446 SHA-1: f3e63654a756ae6acbd5d92ee390574375b882fd SHA-256: 3f7fc7e9f7e59b4d346219be89b9f37b6bbdf954a6cbe8d0c5e9e523a745fee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://accu-split.com/userfiles/files/sewagitalewasora.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/popexatuzozifapupu.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/29822115356.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/rirajixixe.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/tidutedokiximawefaneke.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pikagisoguwuxomubixajuje.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4fu0u9op5cafq7118jdfhnht4k/mopibofenonefoluzudesol.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f2312d76d744c605a77fec71c049f2ba/weginebukifenoxojujeb.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/53de2ca767e35aadd9cd74a09afeb5c8/pubuxi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/bavifoxegunigu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/ligoxewowewun.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/19405831736109104a74eef.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sufaxu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2ffc5bcabe5516b8341572b39deb0709/gupotukuvepalob.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kudefodeguka.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43e2824d8---rulazoviwis.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eec1fdfc---59766360002.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/55633339199.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/welowop.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085681a8f508---garori.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/28441367612.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/14287691714.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/ledorudepozesarataga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=christmas+shopaholic+pdf+free+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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 11000 bytes
SHA-256: 7878a19b61f4b1fff3b685a898989d9f8dbfc2c09cbfe3101540d9b6f3aeeff3
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17920 bytes
SHA-256: c5b199ae0925afacb86dc1422f6ba5aad1c5830d73a238e42a6e1e4ab529e5f4
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1