Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bcd93f6ae23e4f…

MALICIOUS

PDF

83.7 KB Created: 2021-08-30 17:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5744e5509f73b4696634b8fc4c89bd35 SHA-1: d8af3933e3f424aed8028bc935647cff7882c044 SHA-256: a6bcd93f6ae23e4f0ae36e31eac2b718d6d6645cb2dfe83c8c263b5670ee6f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=talk+about+yourself+in+english+interview+examples PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8pl5hgroj2ahdv6hvt0pilglho/78134965627.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dojuxutogivadegetirivo.pdfIn PDF document text
    • https://bauarch.bg/files/riloporaguru.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5j84dtu86cj0gkqf4v0s8930h7/lafofaxarufe.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/nufanukebapuxewip.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982a54ab9d9---ruzita.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/lametije.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/12259951098.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/kedobofutotuxax.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/44604208052.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/82012160043.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/74739249049.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/23929261538.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0373eb2e8---murekix.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/movufabunizopererevaliz.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/gatovuxudekep.pdfIn PDF document text
    • http://akademibt.com/resimler/files/balofasozim.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3a1e3027---33430341919.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e6f5f80ff40daccd92ccf0f0730e1501/25517206983.pdfIn PDF document text
    • http://capri.lt/userfiles/files/towokafaziladino.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 11468 bytes
SHA-256: 353641211540bd0a79168fe1b68dbc0fd16578a607903051a29f7a0e12c79f46
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 17112 bytes
SHA-256: bc1556608a6e631dd13d8eb29de7904a99ca99ab36829f800a3279286ebddc13
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1