Malicious PDF — malware analysis report

Static analysis result for SHA-256 a366a7b66a172377…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 08:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 854b7d26130f37558a3b0188cf243aee SHA-1: 34f295a1f41e983544e9e70e145939ac40caded5 SHA-256: a366a7b66a172377f1d37c42775da6b759ccf5e80f0d33af6b15963359084fa1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9431

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38beebafb6---vumiremo.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cp2vngmpq27upbdfuk5tcvrs34/gubokatufokanuletax.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/zosenutexomijetepenux.pdfIn PDF document text
    • https://chp-travel.ir/data/file/34937061494.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/41395226328.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/rafabudezerolikuxufunowut.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cc627293c---kugimanene.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342b5d9aa---1821375268.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rukazotonaponatatexa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/soxiriwiwuxejewiwolegekug.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/kiminimuwoxanedig.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/lusidinusupitaxila.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a91c86f4f4bcd7618b5358e3fd63e4a9/lozezibubifojajib.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608efca66732f---72277097766.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/muloxiripixezavuveperet.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/17525858058.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/60121056454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+pass+the+ati+teas+6+testPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 17772 bytes
SHA-256: dca53ca47655b23a25d0aa700398c1d8bb5ae8077f7ff065ffec335a94e53892
font_01_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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