Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a899ab3ce8067a…

MALICIOUS

PDF

121.5 KB Created: 2021-06-26 08:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e0a3d01d80980a587ad36f201c12bc8 SHA-1: 4aaa066731aa1e6498d79c34ec7247537837115e SHA-256: 91a899ab3ce8067a9457ae45f320505fd9490ce552cec4a9f55dfb915ae8a039
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious files. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's content is a lure for an advance-fee fraud, likely directing users to download further malicious content. ClamAV also detected this file as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160862bdab63a5---sipatapev.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606df86c04e18---13678814788.pdf
    • http://mywayrtk.info/userfiles/file/zudawoxuv.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ac420ee9efbb0b03ed6e26410e973736/32020889354.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1c3be710---toxakiramama.pdf
    • http://capital96.com/userfiles/file/22437809438.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609480d7e29e1---11431435582.pdf
    • http://jingluo.net/uploadfiles/files/5627478226.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7c0abd2a---bubakogapoxak.pdf
    • http://harasim.cz/uploaded/files/fowarokixelemozufow.pdf
    • http://banhangcongnghe.com/upload/FCK/file/81715027591.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a41e105ff---24594898832.pdf
    • https://ahreco.com/uploads/news_file/85863892509.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160793d8b9e1b9---61636139522.pdf
    • http://kasintorn.com/images/upload/files/66999936225.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e3edb005398462c06099e067637de13e/61858953308.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8368a0619636755c20668c91d05ca6bb/voxitetonin.pdf
    • http://ultraljud.nu/bild/files/99883353965.pdf
    • https://noddy.nu/images/file/17534831997.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/sonodobuvum.pdf
    • http://haustechnik-hagenauer.at/wopizejedajunagat.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/libume.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5a8de3f22e82df4707d99beaa88d4ba8/fozatubugot.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9491171aee---14764900029.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=government+owned+companies
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00014ab2.bin
9c8d3559c521536ef0d1044da99edee7cd8153e70519c22dfd29154c285d0c26
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14AB2 17408 bytes
font_01_sfnt_off00016504.bin
d6078d66e331930fa74b92494408bdd8676a32a493a04f2d4975ec56d84c024c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16504 10820 bytes
font_02_sfnt_off00017e07.bin
02715e14de574de0337c137ed1fe9a08e43d4731266b609179f2a60e1ce39810
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E07 2604 bytes
font_03_sfnt_off00018912.bin
dc35bdff6c69ec3247fa8ecfab0d9f699eb35936b494815d26765dbfbbe37673
pdf-font-stream PDF embedded font (sfnt) at offset 0x18912 23016 bytes
font_04_sfnt_off0001bfd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD4 16792 bytes