Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0effb0ee1b2b82…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 20:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 064c151b34d0f67c0d609122f217cb3b SHA-1: 757903ea6dff7abd2aefa2babfd0e71687f56285 SHA-256: 8c0effb0ee1b2b82eab31f92c576bcd61d191281c2f89f47d5d5d6c24a0e3768
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS platforms, suggesting a tactic to obscure the true malicious destination. The presence of a 'password-protected archive handoff' heuristic suggests the PDF may be a lure to trick users into downloading an archive, which would then require a password provided by the attacker to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461459421a---fawon.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9ae7f73c5fd86703e146febac8d105a8/nusinozufeji.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kisovijexufuwupepevi.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/ginojagalu.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/68227956035.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/31043195496.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zuxuxa.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/30955804771.pdfIn PDF document text
    • http://cmtsport.com/pliki/21557383414.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8610332c---jerudamapigowalodana.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04eb830e1---wizamemesetorakigogib.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lixewumewajikopiwa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e7837a58d8e511ed35440542119f577d/55675170851.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4c88d8de---72463667887.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jivobinowabozavidare.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/wikozubonibuxixep.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/26446753681.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/50831404876.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/36131000368.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fe14841c64b9a5e0d6ecbf03190c9a45/35087199565.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba199b9b091---kidopewuluxuwe.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/sojapo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6891e2a5---90823583735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=libros+de+periodoncia+carranza+pdfPDF link annotation
    • 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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10628 bytes
SHA-256: e9889327858b8c1d3c34e2d8f713059dee4b883537d60b469f3240ae79d449b5
font_02_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 19464 bytes
SHA-256: 651df65755aeefbe9cd71145fbcce4f68a00d80620fc605c435fe92b90a3435c

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