Malicious PDF — malware analysis report

Static analysis result for SHA-256 946cf371b35c2394…

MALICIOUS

PDF

97.5 KB Created: 2021-07-17 04:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afa3ddde4fb383a782d519c3fa2c3c74 SHA-1: a3001a6ec8c26cb0b6cff3618e5e30bfcecca7d7 SHA-256: 946cf371b35c2394a83f7ba110dd8750a2cb9fec98b57596f4569e833e050b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous unknown URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/03d81517dda9cfe84431500a487f76ac/gamuriwagenapolozofegiben.pdf In PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/donokarijinezut.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vr1cugs3s6aph9sqhdook4vq87/dadevageriterafad.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608564786f36d---17732957314.pdfIn PDF document text
    • https://alutat.com/data/file/fowiserebin.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ba2bf8ed---26686310417.pdfIn PDF document text
    • http://yilip.net/userData/board/file/dadopimemafinawabedukuxif.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b9224ffe---zigosuwumutijila.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/g0nfesbd5v4llbgc1tfn0pe03j/77205504465.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af75a014---kudidu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/008cd89b50ba687252bacca654901bfe/rojukirurumexoruwo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fc620a05e009abac15d080dc8db39e61/zivorumajatuzojo.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/87498831362.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wapozadazilexadogolikidi.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/felejawebazepuwaku.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/75615daa2695ae0cf43c570b17c98254/59715937313.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/walagimidedagatatezigojop.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/baravefoxizulum.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9034b6314916681c2b06888f410ada52/zemafan.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea94d7afd9---9540999217.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/mawuf.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7e6f3c19---79349145579.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/56022462120.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/xivedomuwuwogekofutogijix.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/fatilakiwote.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d4c01d6---jopenuduwijalajusajaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+40uf+capacitor+is+connected+to+a+200v+50hzPDF 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
font_00_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 11332 bytes
SHA-256: 26c7041f8cf7ed46863300692320d7784578b1dc21dc8df5f9c57f38a205cd50
font_01_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 1660 bytes
SHA-256: bfe43d5959b2317135891740ee9f6bbd83044a2dfc391827d4c50438b6b55e15
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 18716 bytes
SHA-256: ea23e7b09fcb8f0549930252bbb95ac03ce0bd7ef3db9781c1b968802de3dcd8
font_03_sfnt_off00015df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1