Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ce4f1f37e9cd45…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 23:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a29e8af6e8fe44e1b8fa504ac5acc41c SHA-1: 6f7744fdcf18efe4cc8b17f140fdf536652aefc2 SHA-256: 32ce4f1f37e9cd451de6a671c45c7ac9b895f58b60798ad2318f10d0c8d3804d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=jane+the+virgin+monologue+transcript PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/664901de67a1d0abb81baa215eb1c669/90528675209.pdfIn PDF document text
    • http://kunbot.com/upload/files/87289341166.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160726bba1d91a---12539740423.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/sajelika.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7e0929a46---sijadovagujibo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ervs44j8gbkio2cc91ot4ko934/gaxalitesewufidinedezotu.pdfIn PDF document text
    • http://www.toptehnik.si/images/logogemekikalajafepa.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/51280702596.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e3d75e7fc---46173277639.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/16015172063.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/bomirun.pdfIn PDF document text
    • https://pepsima.biz/files/file/duzulebebejamolupe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a59f0594e3b7e710f19eb3e15151d035/1749577930.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mljfc4j2bkkab4qa6nh4to399j/mebeberodepuro.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gererasebogikumepod.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210816192122.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fusod.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/kegezodokavexi.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/25368519062.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de8e7923a75---pakalulonowujajusar.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/fesaxomabagarozeli.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/bf9ev7lr5pcuar5rvij9qla37j/7241890184.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e860a2764472ae2c73ee2037159a512d/86933565535.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/70828536803.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10976 bytes
SHA-256: 7520602a5bfe907a31492ff7b94b06e430b796cc9cb3c2820e81bbaee97c2aee
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 17000 bytes
SHA-256: f6656deec43a0869fc5a3723dfb0cbe7f59e8434de5ad84fabb7ee7a152c55ca
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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