Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab97eaca558645a5…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 14:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1956266f0aafc3db94cc6fa077a9bcf3 SHA-1: 5b64ff9fc34d8b925e9bbac9316f3dbb018c62ce SHA-256: ab97eaca558645a5393d2d9cbd362ad6d151699e5e0047b954cc5f909129b974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect the user to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mcpu57848b32alvrghhr0uij36/lakavovitipo.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/001pirg0v6vcu88ncpi19k2ha0/kixikujafefu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cc8fa288a20f96c19410216a859eb2a2/84537736805.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vufejiripuxivijisubi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d6de76bdecc6dc134a7049033a83e918/tigedunulexulojagenorekeg.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/817fc4e9a6e0803da93f5e1a955b6ff5/woxubasuposol.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/61145456074.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/nivonulewo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/77e20469c7cdb450328c301f8a6172a5/42902837536.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/917dd389db5d05fa4f845a63cfe85790/zogegelipadewex.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/masgm3kimledumjpnlm0h3jnkg/takagaxaginijikibajekoveg.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntu96uhan2f8pr6101rdrd7j92/19708088484.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/medididifoxizizi.pdfIn PDF document text
    • https://2acontractor.it/images/file/ferisumixikikakojip.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/7513136988.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/pepaximorafipawozikikewod.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/4587366344.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/57244843218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+45+mm+to+cmPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 10232 bytes
SHA-256: 77649e78a3853139e8412ed5364d74d975fe5f2d1074b4b8d0a5d62c1016ea8a
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16976 bytes
SHA-256: d4edb9429a2fb41b13bc4524d1693636605f29746551c57a3aa153e5347043e5
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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