Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b04d1988e4440c2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 01:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f890c40ce0d06cf80204fd208837a21d SHA-1: 8a4a6bb2200e10bd5762a0214ad01316171ff34e SHA-256: 1b04d1988e4440c22002b80ee76f5b53edd141a57f2711508da5e0212a9fe4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=addendum+to+renew+lease+agreement PDF link annotation
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/gosogagavozomuja.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/57de089fbd467b5fd1a5d5269c4fce34/zisekemidilexirinepuwij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceffce082---42641399281.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/losiradumezojeto.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/zaxujawasitux.pdfIn PDF document text
    • http://upakuika.com/img/file/83832478579.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jk49old7denfqal99bib89phuq/26452582546.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160897b572b1b8---vujubetebi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/03b3f6281ef5878b58ac3ab75d80ff03/muxudanodojokeximuzewan.pdfIn PDF document text
    • https://termofriz.rs/files/nuvexorusan.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/86894366218.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1554dcc08---21872384507.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/nuzikuwuduvaponajutabefeb.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6121878B5F413.pdfIn PDF document text
    • https://slide-bearing.com/d/files/30598857049.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/18053116750.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085db0f6a511---34638634270.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5250726814---guxidozikide.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/ditogebojimigapazebepur.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/negetagilepopesiwoti.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 10668 bytes
SHA-256: 65a4ddae519317318e5273139c47f0057a07398ed948a7bb6fab78d7cded9e4a
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 17384 bytes
SHA-256: 122032e550fd31b6c087233c19d1793d145ba04f02318f0acf726453c2e1ea29

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