Malicious PDF — malware analysis report

Static analysis result for SHA-256 366cc83e143e02f8…

MALICIOUS

PDF

120.7 KB Created: 2021-07-18 10:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 825adb1766f549202bd6c451047c8917 SHA-1: 2410cae92323f7f2ea4a97c1c2d2ae7cb4fcca1c SHA-256: 366cc83e143e02f810716db4b1f452c90d886daeabcde0bd495344d682b59e69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or to exploit vulnerabilities. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://unicon-msk.ru/data/files/ronuponuvegik.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cc6c2c31---40091755090.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf00fbe2f4---62245735518.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0c926f5a---zomabupatiwowugofuwafeji.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tos91762ed3lq52pgsqhhon6uo/sefarur.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608586306dac7---98600427379.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ietk7ngckljrdgvsvg298n4cd4/81284395826.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/50549038476.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/76645517818.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ee2c2ec93a990887a16f8ded71a8cabb/47988553866.pdfIn PDF document text
    • http://furniture83.com/upload/files/gizejanalenetazaparoli.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///92018522101.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/dasakazi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c9614aaaee4abaa196ebd1f0c95aa3e4/49591975597.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e536a8f0f2e---duzenajigefozamubivus.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/futimubebivojukiki.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/95669372867.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/a3v21b209vpmhtj8ashnne541n/61096406416.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01eafad888---rewugole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spiking+sourdough+with+commercial+yeastPDF 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_off00017000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17000 19828 bytes
SHA-256: 72391fcf3f11392b96afa3946a60737b1c7e50be537889e3b349ae44b3401b62
font_01_sfnt_off0001a30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB24 11428 bytes
SHA-256: 13a25b034dd490b167c18cdd6a4a2cfdf01bb5c53606858b96f05e5f03af5070

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