Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abc6d5b287289f4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 22:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17035db2adbad123817955225f3ba2c3 SHA-1: 8c617d7dc1166c06d72e0c3da29dccded4d19ef0 SHA-256: 8abc6d5b287289f47bc3230a44f5291b222b783a8fb12caa0136f623a45732de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or SEO abuse. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or redirect users to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k2btm3uoicttaao0tfsljdf4eg/94683960786.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/71045bb820781c5df6e8dbbe4e9f69de/49916622768.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86485f18d0---87615094309.pdfIn PDF document text
    • http://protok.pro/upload/files/10405089237.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/71097848236.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ec5788ac0cbb858039237f71c4fb0849/12857025472.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/87328670937.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210528122642042.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c64d8cf1a8b---jevepivoziwevekaf.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fefabajavurotilegixar.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f56ecf0b134---76963869693.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/355f53e5d6c98c0eadf57839db01fc1d/bogamixitilozofidurase.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/mukoronerorekubefak.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/74528111732.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a502fddb698---90192067238.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/29ff68c534532900fa6c457bce09d9fd/zovorataxadugoxafibapo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb97e9948f---nutolewupimaf.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50100814e5bd747e3d52a641c2e2b515/62579772603.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/389ff481a7208df30a5563922f9de381/vejinobigolewetepemerom.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/32509329849.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/dugesedutajiluza.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tikowap.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210729_08A1B97D91396910.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/42066163765.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pubositakabiretul.pdfIn PDF document text
    • https://premium-house.uz/images/file/pikofogotumujozivagisabir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convertir+archivo+word+a+pdf+gratis+en+lineaPDF 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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 16776 bytes
SHA-256: 7807cb075d037e201a734cb80a91d77b650983bf9b3996eb3542a5042c6e7aab
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 11084 bytes
SHA-256: 7c2bf44e57f8731e7609d74ce274e791d5f6f3a963b15ab3c37eb1b3a2531ee7