Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afa8505d9f40ce7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 21:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eea45da348dc0ef8d6ca5adfbc93384 SHA-1: 6f87ec3922f5f7ce6a91f97caaf59689792d893d SHA-256: 3afa8505d9f40ce7d2ecf1a587f70d98a7d3d90f2cff8304a859d321f63c2830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of external URIs and a link farm structure strongly suggests this document is designed to lure users to external sites, likely for phishing or malware distribution.

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 http://rymwid-training.com/userfiles/file/54805734383.pdf
    • http://alliusie.com/userfiles/file/58573050348.pdf
    • http://travelport.pl/userfiles//file/78564983025.pdf
    • https://intrigantka.ru/images/userfiles/file/28784791654.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/24911511540.pdf
    • https://grandhotelbulgaria.com/userfiles/file/zedutifawunuraxarunojuf.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1cfc43060bdea830ffd18ae003129733/12167024612.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a1b57c6a---towunolefozapaz.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d3b5ef1c443c874d8948803311b83bc8/72013909019.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9c6a4d65---gosanorizivejunokofanopo.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/juxuto.pdf
    • http://houselandia.ru/files/fudasadagafenuka.pdf
    • http://marthomaiticherukole.com/userfiles/file/zelapuleji.pdf
    • http://asustainable.com/global/file/wuroruzisenejeb.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/refudufulawevejufepev.pdf
    • http://twfindia.in/userfiles/files/nonupododemarugume.pdf
    • http://canoeing.by/pics/files/25853105864.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ui7aqc17vfieff9bcti8nm8sq6/96865136666.pdf
    • http://zabradli-znerezu.cz/userfiles/file/73141890962.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/10ad8f7cacf8116a54b6ec965918c075/79615262281.pdf
    • http://cokhihoaiduc.com/uploads/files/39865163961.pdf
    • http://kag.fr/userfiles/file/kabavolado.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9a1bda4de96442aeee780955d66ac14f/4114127868.pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/54221039675.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae45b1edd3c---xuvige.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=saeco+incanto+espresso+machine+manual
    • 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_off0000deb3.bin
d82f065c3ad58cf849befe1d6c7de5f46faa621cc479463cc931433509a64394
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 17740 bytes
font_01_sfnt_off00010c88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16792 bytes
font_02_sfnt_off0001249f.bin
3fba6c3b82a6ad254487e163667001a473d700602254b29a1860b0f5fb56c96f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10812 bytes