Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa28042a050ced2…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 04:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8484f2bc52552e9a4cf9aa8ec7c811b SHA-1: 62cd1a95c73d76d24bd2451be9d976e10d06144c SHA-256: faa28042a050ced21e462c9267385cd04bc78d22510f2fdf87b6aeb2b0dce5f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting high-risk heuristics related to external URL links and embedded JavaScript. The embedded JavaScript and numerous links to external sites, many hosted on compromised WordPress installations, suggest an intent to download and execute a second-stage payload or redirect users to malicious content. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file as a potentially malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb9daac51---dejerorukakebuwava.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7d98b91bc8fbf7b45e3cd725edc79ef1/14051315071.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb3b033c1---figabip.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/smffq4dtrcm5qms3q122l376l3/34430031765.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6aed3c8d---noxozevika.pdf
    • http://446888.top/userfiles/file/9700630485.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/433476a4d8052b6169697e2746430b99/94371349017.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/57494a2dc94d43c7e26b19b31b0d1a84/rekum.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602201636.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/38999734377.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/330122cb6bd01a2d85e35623ddc92935/xubitogizasilegiratapa.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a90b21664---nuzifo.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/afed0osmlk3skh1q6eoqdpjgoj/dedesumebarusefixufumif.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc36d2a31---85680717575.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df30312cc---57099095238.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jerifesalevu.pdf
    • https://telenovella-bg.com/files/48615979844.pdf
    • https://circolodelpistone.ch/userfiles/file/doditugukeruru.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc86b6240---laradaxixuwoxuwexopetogil.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0ab27451---bebofelexow.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5b6356b4---fomomizeredivuwudu.pdf
    • http://bayanairag.com/uploads/userfiles/files/63157127577.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6epljhh1kqg3d5omlso8euae2m/rufawovosutabuze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=3+types+of+nonverbal+communication
    • 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_off0000f2e3.bin
dcbec874c16ca8246389b0aac5245092bc82af51c07b64d621304c22f5e648e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 11136 bytes
font_01_sfnt_off00010cb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 16792 bytes
font_02_sfnt_off000124ca.bin
91928e2135365e0919c248325809f055d3a11533aab134bacb6449ebd649be7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16516 bytes