Malicious PDF — malware analysis report

Static analysis result for SHA-256 878f5b7235f83357…

MALICIOUS

PDF

91.8 KB Created: 2021-07-04 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b22c71e548ab423af173b6fd845390d SHA-1: 11168aaa3f1393000cda16a94351135683e186ef SHA-256: 878f5b7235f83357b8166542d6e2216be217585c22b759f9c954dd74c2dc7a3d
136 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 CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly indicates the document's purpose is to trick users into believing they are receiving a prize or parcel, a common tactic in advance-fee fraud. No scripts were extracted, but the extensive link farm and scam lure point to a malicious document distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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://rialta.ie/userfiles/files/12947844837.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/324d384eb866241977438a3ffdf86967/paraxobifusenexumipe.pdf
    • http://hitecds.com/userfiles/file/35690412362.pdf
    • https://espiber.cl/images/uploadedimages/file/49885301035.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085908da0661---85382841981.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608261dee3e72---sigevilafadagetamopanafov.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/tomipipemepovejokude.pdf
    • http://krevue.cz/UserFiles/File/lurasa.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806676a677c---lisamirawotaruxi.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/48aaa069c2fa0e3bdcb9c1b26624f7e9/24934150928.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5dc0a401d83acdc338b2ee0bbed2e8b3/59533157670.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fcd0a3e8---zojire.pdf
    • https://transport-vehicules.fr/userfiles/file/rewazopifodegim.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/divuwobedeba.pdf
    • http://jarosi.hu/files/file/rezariniritagemalidalone.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f58696a79---33430515758.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f219ca5c---resakemibinolegepatibofet.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b383709b2c0f7ebdeda7ab16f0d89027/vuvupuzekagepodesodadif.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607415d07cb97---4284232414.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0a3ea3228392c2e6ae95a14f6694db4d/xepaginunobajemogogovidu.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/227084523.pdf
    • http://rld-carbon.ru/file/44725356841.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bradley+walsh+the+chase
    • 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_off000104c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 16792 bytes
font_01_sfnt_off00011cd5.bin
0ef96867df9225865b73ce89290bbf589cdf288d134a98f7da33eae4671a8c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 17372 bytes
font_02_sfnt_off00014a4e.bin
543c25d8e5ed72c201450ceba62638db230525644c29b419025f63b8ec4537f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4E 10404 bytes