Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c1acbf6dc418ac…

MALICIOUS

PDF

123.8 KB Created: 2021-08-15 06:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51f8483f0aa4893c087aba8c4e65347d SHA-1: 42911f918574c05c05822b2d6ff32b116ef5af52 SHA-256: 49c1acbf6dc418ac3f09e06fb21bd31b2ab3c58b63e6269b92b57083550d9231
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sooclose.eu/upload/File/14472168148.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/senitadobenenowejumubo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/juzikumis.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/93931146434.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5eaa16ec---90792840535.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/2228133894.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/62311310154.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9f5774bf504a68d7e508bec789350275/dosorasabotuzule.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b950f1158e0631e3e1c45f1c2d4fa4a/nerizinewowezasoparatabu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0noh926bn79c5i0v22pmjm88ph/vituperuxulagevev.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/94755240165.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/44989747493.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff6435075---85294828331.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8ecdd15e---16919339107.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f327ca3f---wunekowilidegunofowir.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd73c182716---97078160256.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/30514181984.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8ftfsmtvvmnf0tg19tdktt2td2/21801094437.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/7387400137.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/254788f52d89a401d1547d0424a4d094/43509731122.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/6575624064.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e7b9be2dd---dojiwusibemikavu.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg990va24miq68tq5vsq4vkeh6/17633776397.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/49166153497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=function+of+dmfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5968d684d3c858c215bd6b9a8344be12/81628594453.pdfIn PDF document text
    • 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_off00017fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC8 19824 bytes
SHA-256: e9de2e3c1fbbf08a59d8cbe2ddd6ffe80cada4a964744f41f89f77f898acc373
font_01_sfnt_off0001b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAF7 10108 bytes
SHA-256: a8367b8b724d9c9611ae255fad14291452e1079c7a05288a1db01dbf2b522431