Malicious PDF — malware analysis report

Static analysis result for SHA-256 b926a8751ac753dd…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 09:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 057e122ae81df0b273bcec5d52d80021 SHA-1: 8500dae66ce3453b9f88c0866be8c009868a6fd0 SHA-256: b926a8751ac753ddf2263d12b36f02a1d2be0fc961454a0a1585647387e474bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a full-page screenshot to obscure a clickable element, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=auto+liker+for+facebook+apk+free+download PDF link annotation
    • https://angem.fr/userfiles/file/68560164743.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tiginaxofolawobasiwolepuv.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/76560819921.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/72671766931.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/pawuruziguzesivemuxoroj.pdfIn PDF document text
    • https://sealskinz.ru/files/file/48867090496.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mowasabotosowin.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/nulib.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5c4e6f78---19078070163.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/zelizokoromagu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/pipakuku.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/15139205549.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/wiwawuxixuto.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/jotowifozivuxazijurerit.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/muxaxuxoje.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/88499016817.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907160829473.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e97fc5ec97738c2a0bbc895213fde62/42403088860.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/620ce2c5cbe0369004619778a0f8d333/vasulepewesozujewer.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/42043678679.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/lerudojek.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rebenomudujakupajoj.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/selokuwonowapejizupufu.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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 10844 bytes
SHA-256: db56c20f9bfdc93e07a92efa2ed7d03305481a31e6a6504c05b3843d13e330fd
font_01_sfnt_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 14516 bytes
SHA-256: 0ca672b67e1b38b13370f6fe602063211d4df4af241de2feb56ebc925563c309
font_02_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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