Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb08dbf7f70bbc8…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 02:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18d07ca6eeb4e68c1da1ed7d890438ca SHA-1: d83dd9cb8419b804ce6e4ecbe52db807a976f6eb SHA-256: edb08dbf7f70bbc83a17b71eef4a076faee852d8d318a8406cfb83b5058af229
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://daydala.com/userfiles/file/91018702939.pdf
    • https://kovosluzba-praha.cz/res/file/tujasoselinenuravilule.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3b5bafd34e531dbe3c5b5dc23dee52ba/getalonugaralorixog.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fh6nksegdjp3lmsbumdrc14vg0/90128450356.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/nipuwokotaxowumuguwesibu.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cad522e9b7622ceb32843b556160a80c/88752950153.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086b602287ab---22770441546.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c7b028676b99531579dbb66f9fc22d34/paxoki.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a55f1dc6---rulipafizidazibomexuv.pdf
    • http://dges.in/userfiles/file/nozufotokigikirofura.pdf
    • http://studioguidobarbieri.it/userfiles/files/midobuxifulinupojek.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/jagugosukatarufebasejurep.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/34555284931.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f392469861---48881045919.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da39781563---jaxowosokega.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d6300ce39---medusarodup.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/381fd6a758a21ff0b95e73b266f1b022/94282793236.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be352814613---rizogazazejomewiluno.pdf
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/35035492832.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ng9hpt2gonurnsrt6nfp04lip5/94929208385.pdf
    • https://oteaexpert.fr/cite_imgs/file/befotabojixesezus.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c8265f67---kidawapukapobobanoranuser.pdf
    • http://madmojo.com/fckupload/file/jotenerasuvelifus.pdf
    • http://abwingssuffolk1.com/uploads/files/kiseloluwifabet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anything+that+has+mass+and+occupies+volume
    • 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_off0000ffa5.bin
c8467c28b1396159e554c7d74ea3549872b7632bb75186ca62578e1988ceca22
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 11124 bytes
font_01_sfnt_off0001194c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
font_02_sfnt_off0001315e.bin
6e6533d925269cc746f294409f9517e91a7cd26e3ef0d353f9cf002a7ce7a94a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 17520 bytes