Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b94c85ba75f803…

MALICIOUS

PDF

101.9 KB Created: 2021-07-09 03:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 28d7c7d10c1533a4e91dcb667acfe4fa SHA-1: 6c09585c5cb13d28a6c7c698280665b60c5e1560 SHA-256: a1b94c85ba75f803670ab1712f71f2c3dfa6e2ebcfeb40922a09c67efca73fd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malware or redirect users to phishing sites. No scripts were extracted, but the nature of the links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9pjv49linjvk0etpodubtfqh71/goguzulojedezibadonu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/800aeaa483d7716e0799b6b8e275b969/47632181422.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/68cfivp85f4dd1nk2rt9pt0rt4/jimufo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ccbbec97c6f5e4251985c04233147883/78797770848.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c2d89b88c0ceff1412c3198353be58d6/vokotatojiwupefavuwineru.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/javigajulorunidebizutew.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/60d52d041685c6d12332f1f6a58c7ef7/degepakusizokuruxazap.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vedunipuvakatatitupif.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae87811eb0---xakuvitap.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/725464436ebb1ebe9e99c3735283d6ad/91045653060.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/zabixiziwusezo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/49404499331.pdfIn PDF document text
    • https://actor-conseil.com/files/file/juxefugabebu.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70619622025.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a7462d1b07faa4bc5cbf5f9edf7b2c11/2487447750.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e5942c5---54629164735.pdfIn PDF document text
    • https://coluer.ir/documents/file/rulaz.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vurizofudilenej.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df0faed4b---teluro.pdfIn PDF document text
    • http://esistore.be/userfiles/file/40090225113.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/43d9ef2ab3e5396c353d30aae3a73c5f/pilofejunimuteguxuregosu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc18f4a45d---gumopalunoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fall+into+disreputePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015314.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15314 31188 bytes
SHA-256: 084e01e7cf37c8876693b34b503e10391b6ba31dbc98cb9bd5a2c2b82c9ac872
font_00_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 17416 bytes
SHA-256: 1fcf76ec13bd3f20be143b853f8404833cb5b4d05de4b5a342967ba6add41548
font_02_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 10460 bytes
SHA-256: f64e96f3cf3190e4f27714ed9a385cfe5d6470815b05ac41673e6142d47df6d6

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