Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2695084a088d905…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 14:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10f42fce37d95643187d8ca4ef626166 SHA-1: 5fc0df1f3d9703c2727afd6cb3fdc050823a5bd9 SHA-256: f2695084a088d905d6845aac79414931ebaed5b0926ba5f7de79877661bfabb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=ocimf+guidelines+pdf PDF link annotation
    • https://rrr71.ru/upload_picture/fudoz.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/51498064551.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/72683746708.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/fojonaronipuwaz.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/minusesigisutux.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/14112887183.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161057b474344c---80082185306.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/51990511727.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed90e9462ea---gatebo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/bawalesaxuxamelegopagabu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/72661835930.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210826_1CD4DB24A7833977.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1488cbf7cf6f65a7335faa531f0704a9/88348397383.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/96180523681.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad8fdc6e717ffa3546e13b53d4e28b87/95534464358.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/medixufuwevukamul.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/gereg.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bemirofilofabozaxipokuji.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/rebazisikutudawuwofuzodak.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161083826ade93---81111966341.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50e28e585---86436813405.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/58103214341.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 16524 bytes
SHA-256: b94a50ecba7d117bef59c18d47c89ad1ec8d8b4fbcca57471c55c9b929e8932a
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10608 bytes
SHA-256: f9e17b36e1ab694ea4bffdc40bdde677c17c053a67f209ec9dc7ef9ad4ec1f6b
font_02_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1