Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f7a6ac6f934bad…

MALICIOUS

PDF

91.9 KB Created: 2021-07-22 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d9d9cfae9907c50f8317c69895b18a5 SHA-1: 7bce2103788c7a777fe153e4c5f02f08e953a0cb SHA-256: a5f7a6ac6f934badc11197b84a60feb345010ecfb89eb44b822a8417f09f5a81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to potentially compromised CMS upload directories, suggesting an attempt to distribute further malicious content or host phishing pages. The presence of external URI heuristics and link farm indicators reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/aeea785fa859e37498b6b7123d5fd363/jaxud.pdf In PDF document text
    • http://pc-driver.ru/userfiles/files/90766664930.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xawikizelupe.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb20d41009---nijav.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gk0cj1orlpatqbji7t7uan49ba/xobevatepibolutugarofu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3e86faf0---32522989325.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0ca6a44d---4826256324.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f863f65e674---98865907952.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090186b91561---puzinunifipuvidupi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ddefef3---46479151846.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/53309936722.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286fb9238d---befinulufokidowobene.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/2736399219.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072efbf0a6ef---gasojujebuxitulilesegujos.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/19097441681.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/88407318555.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pijosebidufiguwejasux.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/71212190299.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/16466f1b2e9999d167f6381de0b28da9/gapoxovowevuzoxos.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/69627155409.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/sekipamulufi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0b784fad---24254697725.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pejin40dlieqlrbde2s4b9ul83/24062549659.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/41642813744.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/d5f08f3bc6ff50f33bce1c86f412bdce/82209634070.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/nerulaja.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/53097192326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=civil+services+prelims+2019+question+paper+with+answersPDF 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_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 11532 bytes
SHA-256: ec2294f6015f0bba1f6c6d0c0ef7ab06d67b4ebb0a5ef5f3d93801125a543467
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 17004 bytes
SHA-256: 68508df2ad4be4604b369dba9d99cb3f3d4b4b5a638b108ead14b3e9d7e2036a

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