Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2fa527d319a431…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a04bd031b3109d035751d79aa4105357 SHA-1: bb1d0bd83820e6aa8fe84a5a517f7387bb7194ff SHA-256: bd2fa527d319a431640f580a0d749157fde5a6318c6c5c18a98bab2434fc2f1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple external links strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=least+common+multiple+of+3+6+and+9
    • https://genegurumiraclehealer.com/userfiles/file/nuremowapasusuviririfi.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3812d9ab437f4b2ac67844e060b5bdd/kepebegonimavosuziri.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f191265---98484948751.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c424d25f09---71482337519.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0b6c7adb9b3bed6525c03aa3c616864a/poligexitazezado.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca015a476d---zunisoregokuni.pdf
    • http://angelescare.com/userfiles/file/romikawurifina.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/13564093982.pdf
    • http://ildongwire.com/userfiles/file/witafuzimigu.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/luluzumuvubotunonobatido.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611c50ebac145---lotatuvulibufaziduwa.pdf
    • https://shen-su.eu/gfx/userfiles/files/kowamumowarinaga.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fd717bf---54268642922.pdf
    • http://agarimo.com/archivos/archivos/47339139828.pdf
    • http://rhodeislandalpha.com/clients/56223/File/35799937499.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0900b434---bepexevirimitu.pdf
    • http://ekonopuntos.com/campannas/file/11746895050.pdf
    • http://www.celso.org/download/17845707329.pdf
    • http://eastcoastbiker.de/sites/default/files/file/50619079198.pdf
    • https://warungmimpishio2.com/contents/files/sazedevajuzinemijo.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bf12cc810e2440a08500e162bc728bc1/xuluwesumokelo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1117aa548a903f0d3447b6be6ce61045/jodotomalirukapuviviwe.pdf
    • http://www.mustwalge.ee/data/content/files/pirazuvaviragotutuso.pdf
    • http://vantaidongsaigon.com/uploads/files/33536204853.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b950.bin
b3c0ade3e1c720cdc4c25a242cd49f2fc1a4bbb059b7cd0d2932606c3b4b515c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 11248 bytes
font_01_sfnt_off0000d393.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
font_02_sfnt_off0000eba5.bin
6a147146d8d5b1fabaea3589e65b58524e7da0f851cb42fa9b59e6d52f097986
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 13940 bytes