Malicious PDF — malware analysis report

Static analysis result for SHA-256 541370ce782dbb1a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 14:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0682a2fe3b864654f9aafd8664178c17 SHA-1: f6a22a22378f44f8be0642fcaee28b91cf75d8ce SHA-256: 541370ce782dbb1a27c42d8924f6228d22fa9c18a8e28e7f4a16b5094a05aaed
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms and disposable domains. The embedded URLs, such as http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0e2b937c---89060090544.pdf, are likely part of this malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://xageunion.com/userfiles/file/sokimanajaxikurewalojipit.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/63858058066.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/ziwedadebi.pdf
    • https://am-system.eu/ckfinder/userfiles/files/rejigi.pdf
    • http://aaronandanthony.com/userfiles/files/31767780984.pdf
    • http://pronobile.de/catalog/file/43610273787.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0e2b937c---89060090544.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e70e799f---volosupazodaxamojimuwiru.pdf
    • https://sieuthimaytinhcu.vn/upload/files/mabeba.pdf
    • http://hndgyl.com/v15/Upload/file/20219101749459890.pdf
    • http://jamalcar.com/userfiles/file/tiriguburuxopewuzota.pdf
    • http://kanalizace-ul.cz/userfiles/file/woteresife.pdf
    • http://klinok-saintp.ru/files/wusodubazuximodiseti.pdf
    • http://santabruna.cl/upload/file/92845436503.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/51130195080.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a0of21scfutkg32nttvvm3htsb/30267760779.pdf
    • http://hulstcustoms.ru/uploads/files/xosoposo.pdf
    • http://risme.vn/files/bijadepetemon.pdf
    • https://danielfelber.ch/userfiles/file/51497397931.pdf
    • http://brilspa.ro/userfiles/file///womevutoka.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/dejukavig.pdf
    • http://ranch.pl/files/file/48528216997.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k8qmrch534efdbhpc64jba6ib6/67295310615.pdf
    • http://polenes.cl/userfiles/file/65584033655.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chal+mera+putt+part+2+hd
    • 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_off0000d30f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 16792 bytes
font_01_sfnt_off0000eb21.bin
55d46e20a6f38193b6d432d1bcf051d41a9add90d8d1e80102c29967a400b728
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 20280 bytes
font_02_sfnt_off00012070.bin
ca87dd58eb57ad8ba604d235e39b6317487a8b42b548f0f238402dee2945bda3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 10424 bytes