Malicious PDF — malware analysis report

Static analysis result for SHA-256 74888062956a49a4…

MALICIOUS

PDF

85.9 KB Created: 2021-08-08 17:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 892c7949788269700149653960ec3d4b SHA-1: 4c7f5630cfff4f5e22af6b5baeabc64345edf032 SHA-256: 74888062956a49a4e889e2efa0e69483c47ea816cea7cff6397675597e992ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=isometric+drawings+in+autocad+2020+pdf PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e7f8443e5bd875308a558aad61c9350a/98095315200.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jedubatajomo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/lenowelupotulamubapa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0629646785---20940552668.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c8574215---baxorunode.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083221ae2cc2---debaxotawe.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/s05mm9p465b1lbpnkno7l294jb/zewojebapozali.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/pagoxubixovapimuxigova.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zorozulukodemaporivano.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b589f359b1---4081203944.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086144a7acc2---bixurutuwafusit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc00b323cc---22649527136.pdfIn PDF document text
    • http://goref.ru/files/file/dapaw.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/49rom5fqmu5vfb5rk107irj3jm/pujes.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccdc823b1---vazozagafomobakuja.pdfIn PDF document text
    • http://atya.eu/files/file/68386400705.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/38045501853.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42309184322.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/pagimopaninizixutoveg.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/repaxilogojev.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720942ec4ae---99702592893.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/vuvidaxenavik.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/wupeditijapekirubixa.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vofopadake.pdfIn PDF document text
    • https://www.facebook.com/acadsystems/videos/3In 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 17924 bytes
SHA-256: bb48f69fa645f1eb5e13d462a113903c5e23a4f10b7d0956b5f5bc45f204b5be
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 11296 bytes
SHA-256: f3782b8b7f5364db7ee1d2ec281dfd634c0b2af2b478976948b669d197617413

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