Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ab2fd1deef2352…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 15:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f788151ca56420ac5bdafbf625f4d6a4 SHA-1: 92bcd668de3760c3c30be16eaaf0a705014e0eed SHA-256: a9ab2fd1deef23526ec7157461a5ccce741bde6efcae27f1a7bc6997d42b8e39
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files, many hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs suggests a broad campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://bakoca.hu/files/file/sowowatepolujuzelesado.pdf In PDF document text
    • https://parfumzone.ro/files/file/bonujowopolifodu.pdfIn PDF document text
    • http://myredm.ru/uploads/file/33390028367.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/83560446675.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/29388590466.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82444395025.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5a17b686da61c33930511808498d590a/7542779521.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8f96b850917d313916af4b0f632f99a3/98613891031.pdfIn PDF document text
    • https://proxus.nl/file/tewilabas.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/45844050240.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/31480556719.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/33187931541.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf5caf75a---sedosijoxopomevu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6571895646---5525283566.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2a9a6d51c---vunowobokojefukizajos.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/34652590242.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/rupekazo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e59c4b18---81886213650.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/xuziwizogabopipija.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbe84d914---luzorazuvabakozizorod.pdfIn PDF document text
    • http://www.polni.si/Images/files/79721643802.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/11142771132.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a7ea985843d44a99a9382c7f4de0a115/22085778299.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/salafizizafilixomev.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70957249856.pdfIn PDF document text
    • http://chinazzjx.com/d/files/4122911086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=physical+activity+after+umbilical+hernia+surgeryPDF link annotation
    • 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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16340 bytes
SHA-256: 6d9256854890279e71f88d080e4c83e00541fe8db3b20876489935aaad1bd979
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 11084 bytes
SHA-256: 91f4505ea77bcedc9fc20e77463711a155c48c8151f5e0beee4e0eada379ed2c