Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb56bb306ff97055…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 00:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac7b49ad94fcee7618c1e9e6e17fdce0 SHA-1: becb7594acb6778222af2c8a18d3d337954a69c1 SHA-256: eb56bb306ff97055022b8ebc0ce00366047ef005758467a2b436089d309fbd16
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mongolia-volkslift.com/uploads/files/44511205316.pdf In PDF document text
    • http://uniquehotelsolutions.com/files/others/jutapekagaj.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/16490475383.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/90087422052.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/977c65fac0ca369d9f2298121665d19b/87215172039.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/91491354624.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/fc4b03ba0d8e87942703a711c5f4d296/bakajiwuxipegege.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed921cd0613---fikozijuse.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947585c6f47---buvamanaleki.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0dbb0d3844bc6f17c3836e82921c0de0/31576980382.pdfIn PDF document text
    • https://luminex.pl/upload/file/jedaliz.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/vabex.pdfIn PDF document text
    • http://farmina.ru/uploads/files/nerebufunevuxi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/neweka.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/71383920707.pdfIn PDF document text
    • http://moristas.com/userfiles/files/tupovalenipibanegejutuni.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2b5a0a6u43qrcu988s89l9pind/11699987943.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129448b74f4a---kopugi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6dce34a7f2b36226e342905506cb3239/gafezaxuwusiwewokidoj.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4197ce41ae---56706062679.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2135c957---89631715077.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wafemagitejadulu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/94877231481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pug+mixed+with+french+bulldogPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 11024 bytes
SHA-256: bde3b6d84ce8ec877af0cba0f0a9fae644b55980a6a2123cd92a7779fab15b51
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 17028 bytes
SHA-256: b0e93424220e4b034de3d455ca1f0f870d155cb7b223a5370d1f6d9ac695e7be
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1