Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ef0f33123f2a5c…

MALICIOUS

PDF

140.8 KB Created: 2021-07-21 01:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c9942c1ed7810bdea32f72485e0c208 SHA-1: d80cbf5beb62677c891507e1eac1bb4796a5e185 SHA-256: 58ef0f33123f2a5cabd483e44009ff3854b76286ef049fb30127acea340b909c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95118d64e0---11207008083.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b61bad92d---kasupiwomewuse.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/64531624437.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zotojopagitanilosixadilu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e45624aa472f55da679eef7cb15877b/tutinuruvuwofonulitop.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e09315a5c00ea1c87844a2f8d857fe52/wigolixodubakazi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d4a78c50---fakavureginowugitakedidi.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/17255012432.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/86208489579.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sudakitejoferuxif.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/83f36278cb7d51b5d2d024462d6fef85/22145204840.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777ea8e88f---10952906472.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2322dad889899b174b3c80ff1e80684c/69569581867.pdfIn PDF document text
    • http://funperm.ru/content/file/9075574306.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c1138d4d---58484830638.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efae45874a---55236867486.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/96512480807.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d7e9679b7a98441ff3d3a1a518a75d82/dewitaforesodaz.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3a9a3537108f67caa8de678bc1821e9f/19608589165.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd3254348---61933307580.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f70bec6e16fc7950bcb0a300360fe734/kukamarutidolujife.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zeliliviliken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=forty+of+fourtyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3A 9692 bytes
SHA-256: 83a1d970baa53a94580e28577a066361c83d12a2f172cf6c73afa2b9acd01237
font_01_sfnt_off00018276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18276 19716 bytes
SHA-256: 5814e04fc0b4f10a369b18c66a35e3601d3517f5fd7a6a85dcac8deebcd06d32
font_02_sfnt_off0001b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B49B 32932 bytes
SHA-256: e8a26d981b6a41f898da9120f39fdc1792492797b793098f8ae2a710547115a7
font_03_sfnt_off00020de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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