Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e911e89da66521…

MALICIOUS

PDF

90.9 KB Created: 2021-06-05 20:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16073ed2063f239967907e22e8f80bd3 SHA-1: cb23a34480275fa381ac81e01af86088222e6cad SHA-256: e4e911e89da665214c9f62123c5f41ae3b2514a0c1b68f56670c5c7ded782235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of embedded URLs and the heuristic findings point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=balanceo+por+metodo+de+oxido+reduccion+ejercicios+resueltos
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e0b5d8af6fad829a7607649bb56191cd/15366318279.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a358efa4c5a---rirosuxevadu.pdf
    • https://arhometutor.com/userfiles/file/dapazaxupojuliwovudomu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/262s3lttnefntpd3a9t1fs097b/91498611974.pdf
    • https://x-software.cz/data/file/juxutu.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e732c9cbbee9dcdf1ba5abd762377fb3/24521261002.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/706778ba73abc541c7e16875955ceeb8/44590705388.pdf
    • http://billedbutikken.dk/articlefiles/file/48116139122.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160911f584a2ed---pejasapasinigojiw.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cb559ebdce4b77a5d5c421ead559729/23637382173.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5b7c092f46ef29c1c4d7e9254a876007/merumafejapatezux.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3aeb7f38a7448b1207cc2891d06b6dd9/dujava.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fobidiwagotizomamidowet.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/8705b2636af1b01d97830897e9e69cc9/pomiriximokosadeliloloviz.pdf
    • http://vivaibonomo.it/userfiles/files/sojifozikukukas.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d976a55edc---bofasogilakekobemapixaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001145c.bin
7a7017e37c9d615835f8f22a3846b67e7defbb59cd9aa996f61089fc0ff3407b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 5292 bytes
font_01_sfnt_off00012639.bin
81e9058d479b074e2aea8326f43bdd338eefe182db9c9678611a4c52f3e167e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 12568 bytes
font_02_sfnt_off00014e1d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 4324 bytes