Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1da22d531da387…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 23:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcf5367bdf82ac9c982e326e16764032 SHA-1: c494b0602345fb0f74f4fd72689f6b2826aa6bb1 SHA-256: ce1da22d531da38738e38bfd84fc7687a99f4b494c138160f6f05ddc576258df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to potentially malicious sites or phishing pages. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=delete+gallery+photos+android
    • http://otestmanager.org/club/data/userfiles/file/20210902012703.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69dd09977---88609231762.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/94202101942.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/zojuruvevonomibisopitur.pdf
    • http://kartelabasligi.com/images_upload/files/78832982302.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ios3v2qkmtfaepr7oiiad0a226/pubipesimi.pdf
    • https://deltarents.com/upload/ckfinder/files/24880418922.pdf
    • http://baigeleather.com/userfiles/file/71399126818.pdf
    • https://beauty-full.ru/uploads/files/56138818940.pdf
    • http://thermogroup.ru/uploads/files/67499580899.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/nadumixegura.pdf
    • https://granitabrasive.com/editor_up/mavafuzakivogexetukosavag.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/losekafovofupazaji.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e2fa5ebc---wunaxobataboto.pdf
    • http://labradory.pl/file/kesetuguxetuk.pdf
    • https://minhvuongthuphap.com/upload/ck/files/2385703286.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/fusitediloxemizabeto.pdf
    • https://gkia.org/kingkong/userfiles/files/fivopemegine.pdf
    • http://jshtextile.com/UserFiles/file///51448538517.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/24155466718.pdf
    • http://skonasystems.com/userfiles/file/niwitu.pdf
    • https://laplacedesstores.com/upload/file/8039010962.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a8a2c4ce1244880f4cd640228e1b8ce6/98025215534.pdf
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/40005818054.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_off0000d7c3.bin
e2f53f99e13f0cd4da378f840558f8a15e5a88be2ebeb468bb14b3885e24182d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10784 bytes
font_01_sfnt_off0000f05a.bin
278847d76234e1b2798a2f8f4b692565febb6dfbd5bc3ed1a82b13d24861cbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 18172 bytes
font_02_sfnt_off00011f4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16792 bytes