Malicious PDF — malware analysis report

Static analysis result for SHA-256 6794202da0d23db4…

MALICIOUS

PDF

77.7 KB Created: 2021-10-19 05:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3be0b3102d0e8aaaec09422b2ab86da SHA-1: 01e75b798216735d90dfb5fc1bd95cf4ba83d150 SHA-256: 6794202da0d23db4b1bf313b5f2750f7622de881a3ed6b0f7d615f75892c66ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://savaksangida.com/resimler/files/68517063319.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/38365634949.pdf
    • http://gniortho.com/files/Upload/file/4070909739.pdf
    • http://korvet-sp.ru/userfiles/file/93475760388.pdf
    • https://ra7a7p-h3ba7.com/contents/files/wudurujodesajokavuniraka.pdf
    • http://moestuinwebshop.nl/userfiles/file/fusisewe.pdf
    • http://aztkgbv.love-mrt.com/upload/files/29176701124.pdf
    • http://skupka23.ru/upload/m/pomisunejorogutug.pdf
    • http://fixafilm.se/userfiles/file/lejolaforiponibudax.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142aaefd98ce---rudawalazijaxixodil.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdf
    • http://czpohledavky.cz/userfiles/files/sovozopazo.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/54b4902f514fc43a1c9adc4a21a15b87/46850132851.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b708342e53---jolufifojozalajuginoba.pdf
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/sewilipobok.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/vuwumo.pdf
    • http://wgadget.com/file_media/file_image/file/sutulal.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/jokowaluwutirob.pdf
    • http://thevisionkharj.com/userfiles/files/95565321121.pdf
    • http://good163.cn/Uploadfiles/files/49897772345.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f19cb35243---79820435402.pdf
    • https://aljazeerahdrilling.com/userfiles/files/zisus.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1616cb27932f7a---xefamor.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=exercices+tout+tous+toute+toutes+ce2+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_off0000cbc3.bin
3dd0c51f3a3368f36f2bf0bb022775214f5cd01860d696f801a2397ad8a83071
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10608 bytes
font_01_sfnt_off0000e43b.bin
94e436aee923a9d9ed368f50ba5fd2e7ef630d42304bfcffb90a8fd0f085b1a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 17624 bytes
font_02_sfnt_off0001106c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes