Malicious PDF — malware analysis report

Static analysis result for SHA-256 c329e4a07a4dfcfb…

MALICIOUS

PDF

94.9 KB Created: 2021-08-29 08:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbd1ce8603e34779696d9d82dad28c75 SHA-1: 0d4b912ac3a448e1b1343d1c41067b71cce68b04 SHA-256: c329e4a07a4dfcfb3983bbd27dd546ceb0843b76019a2ebe72ba9fe6c305641d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b370382e---37069776757.pdf In PDF document text
    • https://mattress-leader.com/media/fopases.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nd7qhgubqkqefi3fijdk2l1r0k/79473900908.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27afaa942---47758840701.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/27188136513.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5596a662---12734663688.pdfIn PDF document text
    • https://deepex.hu/hirek/files/nakitunujagopazumuraseg.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210808190640.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/finewe.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/64607496810.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78b654f7d---xevuz.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/df3eac01e2f86f688a23e71e9566e3fa/10206375547.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/18804715728.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/77403399754.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e270e97214---60037220030.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ca93bbf891666e0abec1e19f0b49bc71/65988309949.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/29134783649.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/banotunataxixa.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/13903860521.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a172682c0---zowijegas.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/519cde8705aff39c18118711815722c0/61995721364.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-20-14-57-02-15XIRqAE.pdfIn PDF document text
    • https://service-panev.com/userfiles/67769121162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=legend+of+the+five+rings+5th+edition+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_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 17884 bytes
SHA-256: ae47e0f44e2c199ab21bd21e4e92c79126e08a315a2613100348404a0a295fb3
font_01_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 10724 bytes
SHA-256: 0bc09bf441c2e6ea5b1f466f4367e9c13188d2f28c484ad215672d7b1247d251
font_02_sfnt_off0001546c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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