Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03c79ffa4e6645b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 07:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd0f9eacbe99c530f772bd6d47accce SHA-1: 68ef2c3ad79f7836e4cf891a26f67db74c0af1f2 SHA-256: e03c79ffa4e6645b7d117f61ea2225dc7d09dce5ee0c3ade7123d21c5f87ba2f
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7869d04b---kinebukosa.pdf
    • http://balaton.varosom.hu/userfiles/files/36247853522.pdf
    • http://ingpiazza.eu/userfiles/files/kigafuvide.pdf
    • http://chroscina.com/userfiles/file/44972090712.pdf
    • http://servicedental.it/userfiles/files/47949015532.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429888cf075---bezapisasedijunij.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b5743e9f029b71b9be8971d054d084e7/lamulewurivokon.pdf
    • https://hbphoto.ca/resimler/files/63416080483.pdf
    • https://austarpharma.austarchina.com/upload/files/1254164270.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/86159699645.pdf
    • http://mprime.net/ckfinder/userfiles/files/85117792935.pdf
    • http://dioceseofniranam.org/userfiles/file/zotazatujipomafamelovuma.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/merugoxedeg.pdf
    • https://thietbixanh.net/uploads/files/muvad.pdf
    • https://onlinendttraining.net/files/41493093174.pdf
    • http://naturalwonders.com/uploads/files/55543478552.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3f58afb---18475650497.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/pezedipufapilepazavow.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/fativinenolamogajiz.pdf
    • http://faceconnects.com/ci/userfiles/files/72608579032.pdf
    • https://mihalex.by/files/files/27565420898.pdf
    • http://ychnjl.net/userfiles/files/kebakawiniwexuxareroped.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/24700412407.pdf
    • http://verzorgingsindex.nl/images/uploads/vixef.pdf
    • http://cargologicru.com/sadm_files/66294776756.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8d9fa8572bca259125beb23568f601db/suwuxixemolimuwobonenu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=augustus+of+prima+porta
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
font_01_sfnt_off0000f5de.bin
c2a91ac666dc2d530a84f4d2614eceff020d9b9ea9b8efd20f75770fc3fe2a54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 19540 bytes
font_02_sfnt_off0001293f.bin
165eb83918d8e12c32efbe5d7480d991c6c45b9ad48ae148914ea7766a69ca95
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 10500 bytes