Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd63156e2b4175a…

MALICIOUS

PDF

72.8 KB Created: 2021-06-25 22:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be7cfe953dbcfa5db6da01d9f0fb596 SHA-1: 3fc9543ba3fc2143cae3b7bab9e619694f465473 SHA-256: acd63156e2b4175abc74b565c49da7262378604c266ea286aa7bdbe5b64d4f40
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/edip4a0hap8g8qve48clog1ebp/waxidu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/89b373ebc9d4a7bc4641e1d1c39fc26d/5267571518.pdf
    • http://pensionpoint.cz/userfiles/files/moluw.pdf
    • http://dobrasekacka.cz/userfiles/file/samazewejarefe.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/72656150740.pdf
    • https://mosconi.net/userfiles/file/munepolaxamifuf.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/56752ae89a36d6f1c69e7811e4345f05/94500620203.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf2c3e498---novurujunipujuzexusi.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/54292794677.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0409b2a421e38d28b516fc441cdea949/sazaziruvor.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hvgmph7rvsvq7rigoes9r5m9p4/degutuboniwuse.pdf
    • http://jnnycc.org/userfiles/file/79309557921.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/77b526425cbb7b6eddffd5e2a00e89c4/65706582015.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojepigepaxitokakam.pdf
    • http://elitvorota.ru/f/file/jevekaxusorej.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/girih62lbcubbrggu1fnct1dam/letexuvuveme.pdf
    • https://cottonweb.net/userfiles/file/zawerudepefamijedowarutap.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fb3259b21e1ab3b26217abeae52418c3/32871286641.pdf
    • https://vatlieutaphu.com/upload/files/jasufivizugibodefoguni.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4477db174f---tifetovuwesakuzubud.pdf
    • http://rkmaster.ru/uploads/files/86547532140.pdf
    • http://senseoftourism.dk/userfiles/file/7712172255.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecbe309487---jineg.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/genuduvakifusegiji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=catoosa+county+tag
    • 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_off0000bae6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 16792 bytes
font_01_sfnt_off0000d2fd.bin
1715a16ea1463eef0442b4cf6304db2ae3c436e260d34a1929a6bb07f699d20b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 10280 bytes
font_02_sfnt_off0000ea5a.bin
d29b83c95595187e7f788a65c33df1bf6c4eb3368ef8b35ba51c934ec0362426
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 16824 bytes