Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd03aa99b9de28e…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 13:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a7d64ef22879b45608494b4e0bc7b3 SHA-1: 5ebd595e4895ea87d8b7d5c2b880e4f448c17c4f SHA-256: 1cd03aa99b9de28eb4ea947b39a1150bea02be211546173cd0920ea385db9ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=direct+communication+in+the+workplace
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ec9f31b1---mabolobomij.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88217a9741---69336722583.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9cbf068196f8f23abd2518a48046da8f/lemepelubitoduwugakofe.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51d5ab07b---zumejasajibesa.pdf
    • http://riskhedgetech.com/uploaded/file/159700061160af80925e414.pdf
    • https://brahmagnanam.org/fck_uploads/file/32373520660.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c483346d0c---82132929516.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a1bc0966cc87fafbf6265b0d83d6659c/kajudagitores.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a525958a65b---dixuduwominude.pdf
    • http://senseoftourism.dk/userfiles/file/58354676857.pdf
    • http://kemenyseprosiklos.hu/upload/file/61796206895.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5aec45bad---72959806161.pdf
    • http://taxicityplus.ru/userfiles/file/lutexe.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8775a83d9f5a3f918ab9a509ab17aede/xanejijanozo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f26ac73a---vovumenomi.pdf
    • http://travellightnepal.com/userfiles/file/20203369045.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/41720916933.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8977d1e628---61121473916.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0712cc87---faduvadowudukelogejoro.pdf
    • https://ckmandarin.com/uploads/69022443999.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f991d9a2f2---lakuvebudasidimonapekuf.pdf
    • http://suamayin.biz/userfiles/file/zakaj.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_off0000fc43.bin
f9f8bec84e1c133e88cdc41d6979c325080e171f3d0a6c164698a9da42d88c75
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10752 bytes
font_01_sfnt_off000114d4.bin
78eac9e9e80f7a26b4d0ea2f7a1e4b6b73b11a452651b0e25f971161b990fa88
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 17008 bytes
font_02_sfnt_off000140d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 16792 bytes