Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec44df5a7af54f…

MALICIOUS

PDF

72.8 KB Created: 2021-05-05 18:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0ed9f427dd7d1fe44dba0b4c86a2e3 SHA-1: 3df410d9219d006f97cbe0f8837fb98420b0dd14 SHA-256: 8aec44df5a7af54f629180372f9d43b3216a627351580bbbeb2cde30cf268241
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is used to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which can be used to generate PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6c6b19ud1i20jukhvie3euf93q/11056972790.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3ab324aeb2f0de173bd251431bdb6b1c/51924872113.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf23d479ef---67566706612.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607736a526fb8---rifeb.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb384247e4becdc88bf195cdf1772216/4257152821.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d9952954020a77218fecc417232fd821/fajididalokodurisusu.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab1b5cd94---batetopudixulololax.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ea3eb90---gukozabage.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ujt4treohjiqld4pbnc2j9ep0c/maladopajega.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919dcb76ddc---maredobekibelovadiw.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbafc8d5fc---jajiwejixejelolo.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ghq2phesv6hfs3f58bocq61284/42452502938.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/08p0blr9c7dtlqgstoc03u0mrq/44842880844.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d491aa52f6---tepivokutare.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6cd1563c5f46c4e5cece875ce439d261/91407200267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reiki+guided+meditation+for+sleep
    • 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_off0000dfa4.bin
30c6c5495bf99a319faab1f075821d7357c22f34b7a1b2f3b9ff1c5bedf3bd6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 5432 bytes
font_01_sfnt_off0000f214.bin
d97e9374f4a3250e64b6b948a9da4a04d44458a91464e9a821269116de619a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 10228 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.