Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374693e5e1f5746…

MALICIOUS

PDF

89.7 KB Created: 2021-07-21 02:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59019272bb5b933c26c39d0e52bc7ed SHA-1: 4a962a2f3009107d1023e08bd8a6c1857e54a8ed SHA-256: 1374693e5e1f57462c5147e1672315908492e2bd444e2362134c835c3076be88
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/20dc360f18877ef9be782639bbad31e9/maxisagezotitorajov.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6d271d5ed90162266e7b04ae92b2e309/dixufi.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/546c7cc14d1e267b9cf8194a635b7e22/42039596089.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/ninemakedideke.pdf
    • https://patc.fr/imagesfile/lupekejoxubanurujetivut.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92720a941---gewijudosodujoxafobo.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/dugedeborafawa.pdf
    • https://music-group-store.com/upload/files/jurejenofibupanipu.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28874699---7337314405.pdf
    • http://karunb.com/UpLoads/files/razinobedetozev.pdf
    • https://interface-graphique.com/upload/editor/file/85794713980.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b290373a7e---dotinuribad.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/14539291195.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/96190633262.pdf
    • http://av-jet.ru/userfiles/file/dojogedinenose.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a6543775760---41172158510.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e06448e22db9e87fe25415db77368d68/92269357712.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/waxuwojunikederuvosit.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/61242e0f94e9ee0b6c2b7e0e8e3817bd/68316651741.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d0af66e402b4985287ed946bd16a6149/sidamew.pdf
    • https://kindeeyudee.com/ck_files/files/52633462547.pdf
    • http://agnieszkapawlik.com/userfiles/file/xileripikaxuninedurunuxaz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a5755f3e270---dodikarifosiginesa.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/16959074605.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p6j51l8srkpb3rqi9ap6gao6p3/55308655972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chall%27s+stages+of+reading
    • 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_off0000f901.bin
2df53faccc8f05318a2c70583cc9571e0de0febc60b85e84fde30c81eb32716e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 17688 bytes
font_01_sfnt_off0001272b.bin
6838843607481766e9d4754da24ddf04047a9a93cd3e3988274b37de61f85a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10696 bytes
font_02_sfnt_off00013f88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F88 16792 bytes