Malicious PDF — malware analysis report

Static analysis result for SHA-256 986181b2eea57bf4…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 17:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb0ec102d2218b385546bdcf8342c960 SHA-1: 30b3b18e3439fa257c78828d3a6890b33e8bd8ac SHA-256: 986181b2eea57bf4dd4d5340c448a7e0b179a90c15214b3373ebe8cd386d84a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://infrive.ru/uplcv?utm_term=12+types+of+tenses+with+examples+and+structure PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/nidana.pdfIn PDF document text
    • https://menu2uplus.com/images/file/memabebabinagiro.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160871d695e14f---fodimokigubapakogazubunom.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14179260556.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/17313590132.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/tonebifonoximexapeviraviv.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c032bf9b3---bakuvamubavurewelixilo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f080a8d5221---pisalabejulowesozoravisek.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/imkiiefi2apmc322eu2tjujp7i/87757414110.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3239b60fe---5049173421.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gabarorelejure.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n3nes0hq99jm42f3p2mtpp4r8f/gekexovedi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/lugipuvuwozi.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/11311912070.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/davabiwadakezewu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bfa542641bcdee00d03ae7f31dface94/tejemexilur.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a22c1186---bipidipezutuxelefo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160908c365d49d---tamanetepojafuxilotojeri.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gokifoluru.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/57515212214.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077741689b16---judomelozagekovale.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aba3af59---rekobimaforuxebuzo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/mujipewotisazonotifoj.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/jotalowaxatukiza.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16612 bytes
SHA-256: 7c016dbfe53bd626c1f281060fdbfa2a6bb6f5b9b8f2cdb9860bb79c4b445253
font_01_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 11360 bytes
SHA-256: 3643e8e828e46b2814c030dc9a5c1b4762ca07997ee34faa79b1a93df119507a
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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