Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5413ef6ba2b97e…

MALICIOUS

PDF

89.4 KB Created: 2021-08-12 23:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2a739ca0724c058471a252d7b189e09 SHA-1: 4bece41c923dff6f41db25aa6cccf13f8d48fb60 SHA-256: 5c5413ef6ba2b97e24935fc9446b083b307a243e795a506c30a4dcee50d51464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially malicious URLs, likely to facilitate a phishing or malware download scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pixomot.ru/uplcv?utm_term=marathi+movie+free+download+website
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/17e1db1430f89b62e9a2758feae9651c/93861002144.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/bawalelunabatiraza.pdf
    • https://bostoncake888.com/UserFiles/files/fifuzekitidekis.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/93072738ae007703a0c811f92279550e/wafubexubajer.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/joluzosaludig.pdf
    • https://maxflowfans.com/userfiles/file/14424712600.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b31f4b4c97543bb078c7d632b2c1ddb7/48529344938.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099050933381---bojuxovenirubez.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4dbca0573bc5a089ddc5b36af12a4ac9/mepedupafitunatew.pdf
    • http://skrabl.pl/www/rpbd/fck/file/mojexazezitikemurefira.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce740f49e5e---zaluwafamanugefefigofidi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8f642778---83736655975.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d82e54ef338394fac1ddc69abbce4c3/62627529688.pdf
    • http://helloslow.com/data/userfiles/files/8265520453.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/33252920096.pdf
    • https://kidneystonetreatment.in/userfiles/files/dajawedizubiz.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210722_0B533C7B5285B16A.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/545e8c5001d229159d7540697103fa92/37988936663.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecfc67b05---bopajezidoguzafiluvuvik.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f355ac70f8---zefelirenadesig.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d80774346---68550620321.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6ad4d6f811108dfd5099f081a141ce00/jexikebenegiw.pdf
    • http://augsburger-dartliga.de/uploads/file/nemuxedifewuvi.pdf
    • https://m-isc.com/userfiles/file/gixiwuzojiparigam.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a9d91ea44c05a7ca7056d8840efab036/wakivajugoku.pdf
    • http://itemclinicchina.com/ckupload/files/59663912163.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_off0000fa89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16792 bytes
font_01_sfnt_off000112a0.bin
21958228c37af842b7efba612c9b938d73cd273c5210c42db7f1db1ed6285fee
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 10904 bytes
font_02_sfnt_off00012bb5.bin
e5fe3f070d664ecb1a5c54cd077bf5d4760c13ff8f14c186be47679b36953100
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 17080 bytes