Malicious PDF — malware analysis report

Static analysis result for SHA-256 244072fe5980dc8a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 05:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c42f151fb429d6a7d31d9c00cd223f16 SHA-1: 3ca1f5af581a4382494c50b1adabe38563117081 SHA-256: 244072fe5980dc8a908a5509bc74e9c25bf10161a9bf203bba6cb5de3314baaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=aol+com+login PDF link annotation
    • http://giaydantuongphongngudep.com/images/news/file/70647544810.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4fb21a91---guzivatelenikifub.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/pizigibovulawa.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/futuwoluxadofevo.pdfIn PDF document text
    • http://livilgirls.com/files/xawizomotekunod.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vosivizijos.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/ludozokapegutijizukati.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/13014232487.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/66964617421.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210906_F3F22E738A599A09.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/gisevur.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/lamuzisujewugisadevir.pdfIn PDF document text
    • http://slovoveri.org/userfiles/20919485416.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/kumajanoxakuto.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/35050250893.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/45135911537.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/sisolefoponulivixanep.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/sekadanazedodipu.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/20609978525.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xirasejufavonufixibavudid.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e6da0a03583ad05531a07fae6217e9e9/kozoduwuv.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/44355665035.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/60142563229.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/20007702019.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/34980293870.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161391d4879c13---84121852177.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_off0000c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 16004 bytes
SHA-256: 07171f767309e0a4714056a77353614d71d51cba3275fc104d4f89182672208e
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 9896 bytes
SHA-256: 5a1699d6201c1c283c66161285f5547e9a2874a3e3ac2fa3a763654a5cc46c85
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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