Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0231ac7edfe15f8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 01:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d08d513224b6802f1b7d7396755f2584 SHA-1: d751a01c32c71509e6843cf2a90d0bfa9bd78f31 SHA-256: e0231ac7edfe15f853905ed33d6a0147ab3de8b27d10c4f93accd85f66033ee0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=share+files+over+wifi+from+android+to+pc
    • https://begili.com/uploads/image/files/jenapebixowivebuxeleguti.pdf
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/tezupilupofopux.pdf
    • https://sistemagestiondpr.co/userfiles/file/49669557830.pdf
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/zaxowowejotobesi.pdf
    • http://ourpreferred.com/userfiles/files/67148447299.pdf
    • https://infrastone.com/userfiles/files/18705390994.pdf
    • http://mnogonomerov.ru/uploads/file/31179944020.pdf
    • http://solemarservizi.it/userfiles/files/2817770143.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210921_FD1B4F832FFBC8D7.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146536af2042---86963279594.pdf
    • http://kastely-vacduka.hu/fileok/file/lurone.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62c3c60e5cdf98bede8aa9098882164f/44673091173.pdf
    • http://dissanna.com/temp/fckeditor/file/31318138798.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/hge4aro1qe4pkqeie4fauatc5t/58116606027.pdf
    • http://homelife-superstars.com/image/files/xojetu.pdf
    • http://a899.net/userfiles/file/xesepev.pdf
    • http://1day2night.com/UserFiles/file/23088372154.pdf
    • http://atomiccm.com/userfiles/files/20540353422.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/25815358762.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tkaajqk12deqgtr16vmgmirota/mejavabifiberigobitevadaf.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/xumujalubadasufovu.pdf
    • https://stephankeppel.com/userfiles/file/lorolax.pdf
    • http://mu-rrrc.com/userfiles/file/wekegafuropozowezexopakug.pdf
    • https://jiu-hang.com/upfiles/editor/files/wovuxinopikixofozilugu.pdf
    • 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_off0000b410.bin
7cb716635e77fa642ad78c02fe889bd2a15cf8950188f5223618499201c26352
pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 11112 bytes
font_01_sfnt_off0000cdd1.bin
de9548491a9fc9af04c20a26d181892b2723cbf13b3d43ef9a75c8dbbcf3f42c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 16468 bytes
font_02_sfnt_off0000f7a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 16792 bytes