Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f69a29ace5436d…

MALICIOUS

PDF

73.4 KB Created: 2021-05-25 09:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa95cf865f90d5f9102eedc28df9e8fa SHA-1: cbc93e00e9a8cf05e55e6356ffee5e15398fed4d SHA-256: 90f69a29ace5436df8a58e57f3e60a885e575be35407354558476577ddf06122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to a book summary. Several heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, likely for distributing further malicious content or phishing. No scripts were extracted, but the presence of external URIs and the overall detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607630a1c4257---nabituti.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607909b4b245c---94890837643.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f530999---dazoborajulamavapapupo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd922f21e---bopuwuvidigujovugoside.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2222b0667---nodirabejuwumete.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0d042c20bd44247d14f9a098321995a8/lezij.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f37765b747---84281112543.pdf
    • http://poorclarescork.ie/images/wepebiwasoziga.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a165edd4b05---63513331467.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fc46ece1ce9c2f1042f9608f37937b79/26036621271.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898d9ab9c5c---74880816055.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d962f19b---51521354064.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b4a90970---tamujorobolawedelud.pdf
    • http://jucal.es/images/file/39486504540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=resumen+del+capitulo+1+de+la+ciudad+de+las+bestias
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e067.bin
e46212ec041fa4e349b248de8db8f8d01af37d64db402869540f0f15f8040a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 5320 bytes
font_01_sfnt_off0000f270.bin
5f79e50d0b8842d68a74f90dd8fd248852be9e4bb485620c39312a26d3f8c906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 11152 bytes

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