Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0144ec94bb2454…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 13:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b97af4d0b5f5d2e56f988a659b4086b SHA-1: e9fc78139c9198a233b8ff68f12da6b6c99695e2 SHA-256: 2e0144ec94bb2454abc04c717efa79f041cdd2f49ebddba3bfe1087a6f47db87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=outbreak+event+warzone+how+to+play
    • https://paklya.su/design/img/upload/file/kozolomurivoporawa.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086be6e552e6---lesesumopobogijekuluwopud.pdf
    • http://rana-international.com/userfiles/files/75412136268.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b428c7b2d322ae0c81bc254e2250a1f8/4617595397.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pmv6t1dp27ueq6rn24483065hn/20215132371.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd289f037e---75045644384.pdf
    • http://megat.pl/uploaded/fck_files/file/87154447836.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/im9to6bq2m6p3iclsig93usl5c/84052646391.pdf
    • http://ambvetfanini.eu/userfiles/files/fitorexokekok.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f93d2891---79106980695.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf5e03b7---zetozojub.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a42158b7540---33807051658.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6115e3854---30537712791.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/97d9f26c944b7096a4bf0506d0261d9f/tutibawim.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df8c49ecb---pezaderisigozumar.pdf
    • http://royalwedding.jp/images/blog//file/jipevejorotajirowekem.pdf
    • http://radio6deenero.com/uploaded/files/7886466681.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a45562db15b---30932751066.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adab42d7786---zobutunerutaw.pdf
    • http://agcslohian.com/userfiles/file/wegakeneginew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706ba03d59e---nekapujedokafipojoduxog.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db5db7b5f---setevovem.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/srhp81hcnjuudf5673gu8hgssg/lenakorezilikuminosajav.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104291711383168.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_off0000ec26.bin
e02bad8ba0e4efa403da836c92a1add152937091de427703f2e75bcb9d197a13
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 17612 bytes
font_01_sfnt_off000119c2.bin
2155ab2a528cad49d6c2501f75991e5443e11baaa5988bfcf17cc17376763359
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 10772 bytes
font_02_sfnt_off00013273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 16792 bytes