Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4d704af05a042d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 23:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf1c91a8a3bf1a4cd5eacbad34e246dc SHA-1: 836d14fbd6573b7484c6669fbbf4070d59e65f5c SHA-256: 4a4d704af05a042d9d331b2a040c4f8e6a52f1af8b4baa8c42e31d8d89a36be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The document's structure and embedded links indicate it is likely part of a phishing campaign, potentially using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/301aee2f4c2f5ae339091b27ae4c37a9/tijako.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cac8c1a7d565192711e3556ce82d6331/genonedefutumimab.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaba389fa0---vagopuwebinapipapekur.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/076642e7ec537324c977c4610be8c12b/48486764871.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fbe808918---60101320618.pdf
    • https://airshow-bg.com/file/dilawudajevipuvatodafo.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7eb9ca6f2e706592c9431f52b9a56300/77998848124.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6sdu7a5da5pkvnjse47tbdmlf0/84883756134.pdf
    • https://bdaudit.ro/userfiles/file/wunedodilexiperedizowenif.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd06e7d10---45425124886.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0182e00b2---86881224727.pdf
    • http://thunderstar.cn/userfiles/file/20210521021947844824195.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r2gek894b7sfnaqjcohca6013l/xelav.pdf
    • http://medica-eg.com/userfiles/file/64996739745.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2b93f847d77537675cd40b06f2db8a23/17017653060.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/jusazuwalupunotowob.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nqe7lt9973681bia81s5hem4g0/53977678729.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fdd784dd9---38271226351.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/67bae1274f47b3805355994fd440488c/23048528025.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160837a494fd27---ropafefa.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f25347bf75c901d912ed3488a98eff0/75355799188.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c0d4c6ca8efd41c073ba07f92fc98947/sogobadakodam.pdf
    • http://accessiblevehicleservices.com/userfiles/file/98667445496.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=can+you+wash+an+electric+blanket+in+the+washing+machine
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f783.bin
6558111b3429ef9fcf81818a5d6c1de26519962784f437462823b962da3e3960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 17248 bytes
font_01_sfnt_off00012485.bin
0517f2070d45cd219900add2129b787bb33be733bd8c8de85105e7843985061c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 11240 bytes
font_02_sfnt_off00013ecf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECF 16792 bytes

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