Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8af40ec7939762…

MALICIOUS

PDF

82.2 KB Created: 2021-07-14 05:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fe97b0f08e5e95f768edfd69da9aaae SHA-1: a04373adcb97406b5b727911f6f61e60433e487e SHA-256: dc8af40ec793976229e895a1a4e306f8f9a325325f2d75c7bf3e9f7be411298c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+print+booklet+type+in+pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b447d12919a---fumuxexibevoko.pdf
    • http://flexa.cz/docs/file/molag.pdf
    • http://beepost.vn/upload/userfiles/files/wevezanagorojitinixota.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j9eddovt3502fj7041h4p19mln/vujoxutuwuvapuzuguxateso.pdf
    • http://dostavkaturov.ru/files/file/61683748690.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bde42f7875b---zurokutobiwenoxasonoduxu.pdf
    • http://alexhofford.com/temp/files/file/57734691940.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a3ee9a53bd8ab578f2f4a9c74e9f5dae/filepefogapaxutabisufa.pdf
    • https://tarzminder.com/resimler/files/xopilodativigegelag.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993443c1615---72361708012.pdf
    • http://tlxzkj.com/uploads/file/211159044361.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe0c7a5f5---bixexibinumujiragelo.pdf
    • http://mppscstudy.com/admin/usercontent/file/babofibolin.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2cnba2nepkrh88u1flksgh3jb7/jijefo.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ae29adbe48a2d0a98af8aced592177e4/76301150646.pdf
    • http://techhssilverbuffs.com/clients/61416/File/paxazakojexu.pdf
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/saguzipaliro.pdf
    • https://wemservice.com/ckfinder/userfiles/files/kagas.pdf
    • http://aep-tc.com/cache/fck_files/file/kusedamepitodokosiw.pdf
    • http://abpaluso.com/upload/file/vemat.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/neaplpip4t9jt69pkijgguut32/35166747594.pdf
    • https://carrieres-pierre.com/userfiles/file/telijinivebediw.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/d23ae9d83rbik6c0pva8apna58/66404323519.pdf
    • http://bluecars.pl/userfiles/file/jetazutajilitezakuta.pdf
    • http://15889163.com/ckupload/files/nopabazoregenovonolotasad.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_off0000e01f.bin
d7134cc463c4190044c1f2cb239bcc32872660c3444f2ac98f2eacd0349d8719
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16592 bytes
font_01_sfnt_off00010b5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 16792 bytes
font_02_sfnt_off00012375.bin
ee3c3d98957c8d0afff6d14799c4399097dca08cbe871162138854261860708a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 10584 bytes