Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c4e71d30a9982f…

MALICIOUS

PDF

94.8 KB Created: 2021-07-31 23:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f6009c463a77c4b048f97e8052dcff9 SHA-1: 2f74377701bb1386a8a7e89960879fe5493fc126 SHA-256: 46c4e71d30a9982fbd19e76873430ccf119281dbd392d10a0458934e5db65fcb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://led7.ru/file/nexoxuxexarugamilemuturu.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0f27ka3n8c2vh8rk8v07078p99/kidoja.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/50085627148.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b30b35c7a99ff90f814572ab718e1075/68453255253.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/61008914808.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gifozorifutik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502fa9fdfe---famibivedugozow.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/sebitakerek.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/41255269022.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/20197234285.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e75104816dabfd14ab8cfee232cf59ba/96886829290.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gifilikefixapeni.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/noxopovekixodokenebofe.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0628e630---pigikebemimokilawen.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6349ea8b---jujawipu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075375484bf3---jibodemazumopawijaso.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/82140291730.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/wopez.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/65381064112.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073aafa05ea0---japenuvikagezofu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089296f24c7b---renevelesol.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/223677192bbcbdd5224908da83579dcd/20819982626.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/kelogipeladek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=classic+wow+holy+paladin+leveling+guidePDF 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_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 10992 bytes
SHA-256: 4682708ed3a90633cfbee9d327e7ad2894a12b51c3d1406a46a49eb632b243a7
font_02_sfnt_off00013f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 17184 bytes
SHA-256: 2a56b6eba52186feea5f0f4b0b96c2a605ef4186528e6366786911ee088969a8

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