Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f461e32b56c823a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b6db10744daf6aa7730d03471c11970 SHA-1: 188a3b057c21c43c7de114f78a71bc4eacc21fc0 SHA-256: 5f461e32b56c823ab54197fdab2a45f494640a862745c82349819290ac23e270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=avakin+life+mod+menu+ios PDF link annotation
    • http://maksimetall.ru/files/9647340266.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/57542109437.pdfIn PDF document text
    • http://apothepharma.com/upload/files/giraxejol.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30363603185.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bae64e03---95856716221.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/31567685186.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/digimukowuta.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/43468843352.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325813b0a6b---wijanujipapevapexij.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3f3424122f185c8f4a27c8d6578f5dd6/58198537689.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80701838165.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/70987145271.pdfIn PDF document text
    • https://alariel.be/userfiles/file/54552570419.pdfIn PDF document text
    • http://gibisch.org/files/files/wukazaxotekuge.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zuwudetazawesozek.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/voxetonozibaf.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/75921125020.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/30553790589.pdfIn PDF document text
    • https://ferropula.hr/files/53846147973.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/lizazapodonalapizisa.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/sazejufelerori.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55c362cea---12627290951.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908113844.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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10556 bytes
SHA-256: 859fda5bda36208ee3bb202b46a61361fca93ab6a77401e0ec48f1db2c098b0b
font_02_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 16996 bytes
SHA-256: 5d743cf253988c25b3888be2b35d9260a1510a3b980d5aee73b43a7d02071aae