Malicious PDF — malware analysis report

Static analysis result for SHA-256 344e5cf63b7e5d48…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 05:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16e5c96af4354b821d41e4610bb6f955 SHA-1: e87e953a9720f24673799c9a73582da4aa6cf111 SHA-256: 344e5cf63b7e5d48ea9fcd1296d068c35a7ba42208b806ad374fd87fb4a09f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=beachbody+21+day+fix+meal+plan+pdf PDF link annotation
    • http://premiumcsp.com/uploads/files/88051159564.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/47995311278.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/76545928927.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/jemopikololosirubo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/g77vb1684osp1sld5aqlfp60ab/74055175932.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/43117819913.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/32144464469.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/64476783533.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d41dbaceb9ed4aeda5ccd17d92c591ec/punefujofemeg.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/81237923808.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sevapobon.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a35dc227557bc56cd6bb531c79c7d35/nipafonukuzesakale.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eff8a6ac63f---fasuloga.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/jodatufopadu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vedolab.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/63588678164.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce18d2f40---moket.pdfIn PDF document text
    • http://ciskmv.com/css/file/fevuzakawi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/bafapikigedasadodeboze.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/wiranozekebexatezo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fd9fd0a1f221db28f7335eedf48aa395/miletaduruwimabexedinenad.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd66940f2048ee81e8c53265e7afb06c/gudesevux.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/t6hile77n1duh8c4029a1ev090/5570306282.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/93ph1miauj93ra18jo61kt3761/jomokixuwofi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mi8manvqfd220ne7nidm81117a/79301107363.pdfIn PDF document text
    • 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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 17448 bytes
SHA-256: 1d0cc4c9915bdf5106a10eb23316ea26b0394cdc1ed4df076c2f10cae6d04cf1
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 11100 bytes
SHA-256: 7cb135d9375624afbbaf678afcf39584eba246b4d9b81e9de15845db08db1f18

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