Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec160c84cf15fed…

MALICIOUS

PDF

99.8 KB Created: 2021-07-02 15:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e113d61e1088000d3a8e691696e019bf SHA-1: 3daf3c355ba22644d8c0ed9046258b2e49ed92d4 SHA-256: eec160c84cf15fed96c964c724f3dcaaa069de1b85cc032ed1c9bea842263318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, limiting the analysis to the link farm and embedded PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://nitexprofi.cz/userfiles/file/falorexadutobonolifejad.pdf In PDF document text
    • http://fobas.cz/userfiles/file/numol.pdfIn PDF document text
    • https://patc.fr/imagesfile/31839823055.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/516d043112ad4e32c8705ba72655a027/33479588260.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kilubevifafunipokux.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/eh8e1tjffk06e20j95ftscc252/bivunimikejukexobagesokin.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/18961787667.pdfIn PDF document text
    • http://healthywithhart.com/res/file/61017157812.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/sejegolipubuwagos.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab42715ab5c---getewu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5e52f3bc1e9cf464d15146a875a5d7da/18287124313.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aca30297994---lijukuwimemejexenikodu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca9ad884c---35039754205.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45b01a4864---29123603196.pdfIn PDF document text
    • https://sealskinz.ru/files/file/gafepuzidawunalepikijepe.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/zexawiwiwivusarafan.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/kuworiledivatok.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021043012124173499.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/50857236298.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/15008064299.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f2534013b6b42316dd449900398dc552/lasexadax.pdfIn PDF document text
    • https://andrejc.si/files/file/zabijepawazezukijopo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kelonebinalixijizib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=training+your+glutesPDF 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_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1C 16984 bytes
SHA-256: 5749e83ced768a6a21bf4a15b12eaa10eb4a0b6296604a97d0113c88de43eeca
font_02_sfnt_off00016a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A49 10460 bytes
SHA-256: 7f4a868d1dea3ae8e92dbfbfb3f2d9be11d9c4d48a552e7552472086aa5e8106

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