Malicious PDF — malware analysis report

Static analysis result for SHA-256 430af858fb0f6e24…

MALICIOUS

PDF

80.4 KB Created: 2021-08-18 14:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 543339fc4a7345f55334662032458f45 SHA-1: d9a1ea100db5e2604412d8049005b29c54c5e34a SHA-256: 430af858fb0f6e24a7322f4bed1e344ed8f74c782e02073521b8656382e1ebf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of a 'Download Button' lure suggests an attempt to trick the user into clicking these links. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=w3schools+python+tutorial+pdf+download
    • https://przyklejki.pl/userfiles/jojavoxubojexasi.pdf
    • http://aucoindeshalles.com/menu/file/91514588723.pdf
    • http://gdlianyu.com/uploadfiles/file/vuxibagijok.pdf
    • http://revize-elektro.info/UserFiles/File/30010485481.pdf
    • http://voszveszprem.hu/_user/file/20015639478.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9ab2daac---fotajamibevumutirenotamin.pdf
    • https://by-express.com/upfiles/editor/files/77329515240.pdf
    • http://web68s.com/upload/files/jetise.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b424945ee47---fitedifopevofasoniwu.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/vapimajulaw.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36cde3552---13664863151.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/60947b33cb9aaa867c78077f21e05ce1/66979024372.pdf
    • https://actor-conseil.com/files/file/jawafudesenowejojitu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082adea6f1db---navedolipinukoza.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/81462284735.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1a9ba6f34d41234f81c2b4b059efc6d3/vekinilapuwodigu.pdf
    • https://kamarkosong.com/contents//files/49096664561.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8ijcde42j5r95euj2vv8n0vlc7/50374483666.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e2d660e---vixuw.pdf
    • http://agro-vostok.ru/userfiles/file/mexujikilupefokod.pdf
    • https://alatheir.com/atheirwsfiles/file/nekopajoma.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/da0b36e6736ac9f0e0ad8f6e3a2bff70/4588192165.pdf
    • http://kammatrans.com/userfiles/files/lutidedajejokeri.pdf
    • https://tkquiz.com/userfiles/file/tamuwalupitiw.pdf
    • http://dui-antidote.net/images/userfiles/file/takuxomi.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_off0000d0d9.bin
10017095a9e9ca042888812012bdc0ec4c230dfd91037bb67ea7ac19081f39de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 18228 bytes
font_01_sfnt_off0001012a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
font_02_sfnt_off00011941.bin
09c37a0e3285ee8ef75fc71daf8c5cd98a32e95ac444535f1d95b3cc2400b51d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 11052 bytes