Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc09aca861cd4d2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 22:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45f63774ea1b9ae6e0cfa22856a5e62e SHA-1: a0e32ada08b10efb7499c87bbf805c3cb0bb73a2 SHA-256: abc09aca861cd4d2dd12681a3c9690c6cf8e2472ca0b61ede4bcdaeb16a8aab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f326db22e270411764b45c56cf8f64/pivasexog.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/riligidizomovalarav.pdfIn PDF document text
    • https://blugarden.eu/file/fimijepojefilopurebit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be2c5b3906---ladax.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47106313798.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/94340690214.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc4e95190---75612925535.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/berofunumoritakiw.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tadapibonudejefugebal.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/58aefc517d5d0ab56800e680c75d0fe5/legalebevat.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/35217207456.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b254a55885---tupuwunupobixi.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/tofor.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4e9bec7a---54355301800.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3cf0a2da---zuxifibivew.pdfIn PDF document text
    • https://slotpt2.com/contents/files/xiwumapawilazitezagejefok.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5djrh76o8hn2up22378ffvtjo1/17561151689.pdfIn PDF document text
    • http://aimic.com/userfiles/file/niluxejevadasovin.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/60705012900.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n4bcflhvktu103rcnso0m3je5t/47286336525.pdfIn PDF document text
    • http://hanleyresources.com/images/megalakofopekigeji.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/goginired.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/vojegakapilalevijagele.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fozikawogira.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a10705072453966c76f7dfb20a458743/908508768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=decora+humidity+sensor+and+fan+control+manualPDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 17836 bytes
SHA-256: 89c4de3aafff750f490c6ec08c68150d54dcebc17c2062d329749c75324c13f8
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10956 bytes
SHA-256: 19280cebc7e963c39d6f17a1fe0bc0eefd34b818707f37fbd6f440350d7312a7
font_02_sfnt_off0001245f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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