Malicious PDF — malware analysis report

Static analysis result for SHA-256 594f3811f207796d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-08 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 152eb7f4ff0fe2e414892d7973c863f7 SHA-1: a962652079391594637484634cd573f0fd464f71 SHA-256: 594f3811f207796d3988b16d34d09ebca661ac67dec5ac1153ab64753dd7d909
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://monkey-do.net/userfiles/file/sugitupevarewirumibafo.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5619e2cf4fdf08d67282ab639e277ee4/sopivasebido.pdf
    • http://aeronautike.com/userfiles/file/dafumatug.pdf
    • http://iphysiology.ru/upload/sijasutevovedeka.pdf
    • http://autodilykanka.cz/cmsimple/images/file/mozufopu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf7a2a5b---latoribujobatibenexesi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848d35a802e---detowalolexamadalifawom.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f8789f7409f6c5a8361909eb923c1b33/jesaveti.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16765bedce---vodipejez.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd629815d---vivefufeburutizuzofoz.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d2ukcasnmq8muafq34ucmv347n/mavalexukufarejodolasax.pdf
    • http://gpszone.hu/upload/userfiles/file/263986879.pdf
    • https://texigo.tw/upfile/files/2021/07/08/setarepi.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe83d8c0---23234383593.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210611110340.pdf
    • https://quanghuydulich.vn/img_duhoc/files/luzaboxomusegabudadezoxi.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/27679226122.pdf
    • https://cgeminfos.ma/upload/file/jezeduwimegilakemorizi.pdf
    • http://diysmart.net/userfiles/file/11588421489.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/doserojemum.pdf
    • http://ray-king67reunion.com/clients/41562/File/mejefumufafugijesazejo.pdf
    • https://aimara-bg.com/userfiles/file/kepuxuborep.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4b5e597d---fokifesaxezijusevusu.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608993f4a8e86---33900181384.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0a4cce27c---36236427849.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bugs+in+my+bed+not+bed+bugs
    • 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_off0000efe7.bin
bd495b10bf76cde4337edaf0bf83ad9585ebb57ffadb10a5cb17d100537350ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 17020 bytes
font_01_sfnt_off00011c42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
font_02_sfnt_off00013459.bin
927631b3f7dc41e5fc4ebe8d4fda34bbe23500e3d3d3a2e56fe2b9f305f16437
pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10688 bytes