Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4b5c3d632c64ce…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 20:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd4e948a48e1eaeb3f10ee251d7c4e7d SHA-1: b0cb59a0b843175f2bd2aa7b22a10d9360247027 SHA-256: 4d4b5c3d632c64ce261418f451dee9b4c594595fc861a880f711bdac2cbe2a92
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://affectif.ro/data/Image/file/24315911017.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423b346b654---texete.pdf
    • http://luligang.com/ckfinder/userfiles/files/15365153607.pdf
    • http://zaun-produzent.de/userfiles/file/74955807940.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/09a2de4fd271ab3ff9a88ecd7731e669/19348116726.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b616e2a235---68104867196.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614287d5a7553---74489945988.pdf
    • http://reklama-kemerovo.ru/files/files/vuzotefazuwag.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d208b420---88078379308.pdf
    • http://krakow4you.pl/krakow/files/26202142012.pdf
    • http://pileshoppen.dk/userfiles/file/subodinakerinokitejob.pdf
    • https://ruh-center.ru/userfiles/file/52915689273.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53e24f234---tesisefega.pdf
    • http://ckud.handysociality.com/upload/files/11326503940.pdf
    • http://ilovechardonnayhills.com/userimages/fuvisumurivudupu.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n9vc20rnartobaq4odmvaj05sk/raxirejubinewerige.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lexomukoxavegef.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/66845591385.pdf
    • https://floridahouselottery.com/test/userfiles/file/xazigolekelu.pdf
    • http://daltan.hu/userfiles/file/nifumepivu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e583d414cb97733bff3a22fa6c6bedee/majomunudidojigiradomi.pdf
    • http://xycrusher.com/d/files/jisabugibiwijame.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a08cf2f5f---tabaxenagunexed.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mkv+123+download
    • 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_off0000b400.bin
601ac21ca13237299d0ed2c560f3d61d5ea8a10f6ac8f3ed609bb0ac00592aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10232 bytes
font_01_sfnt_off0000cb34.bin
979cc4b9efca68de69f181eaa753a9ddcef7d015ddfd4250f1c4f453099b0afc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 15684 bytes
font_02_sfnt_off0000f2a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes