Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8930e9ea9b0d5e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 14:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4505b3f25bf21bcfa4f87fd8f42f00 SHA-1: b1b1920785d94b5bc6e762c983e7d7e157c812fb SHA-256: ad8930e9ea9b0d5e4241c1e58bad02904ad21fc15dc4a6d6fbbe3942d20015c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdf
    • https://pvcmikser.com/upload/files/69697813875.pdf
    • http://autoscuolauniversale.it/userfiles/files/38882687783.pdf
    • http://rts-3.ru/upload/files/lisexofofigoxuv.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/popesuz.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/gisifepazivapako.pdf
    • https://groupburuemas2.com/contents/files/52753105662.pdf
    • https://trsoftyazilim.com/genelresimler/file/nineripa.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613001e7af816---rexilulodoxabobopozafipo.pdf
    • http://tyros-club.de/userfiles/file/10069812749.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144791b7cc12---xazepidatezile.pdf
    • http://archifolder.com/userfiles/files/puruwarep.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d295e87f8---6727373673.pdf
    • http://brlairport.com/images/file/butizanawipojovabefukedo.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ik9sk6mprcig12a74jgcodbq7r/44510388789.pdf
    • http://waxiangyuan.com/upload_fck/file/2021-9-7/20210907062548268618.pdf
    • https://aawyx.com/sites/default/imageuser/file/88135080913.pdf
    • http://romanakladatelstvi.cz/userfiles/file/nowaj.pdf
    • http://rayhovietnam.vn/upload/files/30903275741.pdf
    • http://t-eamplus.de/web/editor/files/70779476047.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde938871b---62967735382.pdf
    • http://yushendesign.com/images_fck/file/1632567267.pdf
    • http://mindatpeace.us/uploads/files/fanerolamaje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+the+usb+settings+on+android
    • 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_off0000b0e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 16792 bytes
font_01_sfnt_off0000c8fe.bin
732470a427f4b5eadaf2b981cb361aef1db62330cc85077121feb527c020962c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 10920 bytes
font_02_sfnt_off0000e20b.bin
09c83dc6d2aaa5eddc858b216f402d018972079c2c241f8109e7a45578c123bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 14340 bytes