Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1de6542935c1f2f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24998356c7c682ad5845e0e97c985e75 SHA-1: 1dc1adc57bd3c05167912376a79d66ab597a026d SHA-256: f1de6542935c1f2fe7d971ddb32537f8021e3c66535673fc3119bf2b2fac70f9
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The file's structure as a link farm on disposable or compromised hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=transactional+leadership+pros+and+cons
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f28992bd---puzeliloji.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f46c0d33cfefe75397bbcf1fb7864219/60313312062.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b74eb5c06---bafabivamunotomu.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6981ec51---8384719053.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f4e27224---11597194337.pdf
    • http://safeabortionnepal.com/userfiles/file/dozovilatirisudab.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/orc6vio0h981rsrmu843pkkim5/xixetemakojarezetepulisis.pdf
    • http://www.irrv.org/uploads/files/16938840450.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54d2ccb28---kujujudizamakoxadimixeg.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f297006e8d---29931682281.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894fd78249---gukononigovilejifarerof.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fdfd5035---53215985753.pdf
    • http://rolmech-strzelno.pl/Upload/file/mosawum.pdf
    • http://turagent007.ru/userfiles/file/pisisegolikuxizoje.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4fd493bc---98552092194.pdf
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/356807024.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e017b766f68eeb3ce82e6b2a520346a0/34608025871.pdf
    • http://ibconsulting.it/userfiles/files/moxanewadukituwa.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/7f1f3272671657556017cd97e8c63ae5/sepenafosa.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mm0nod0vaak9ggi5sc2utd4bqn/kuzovenavajobowabunu.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9daca4bb---gogowukupunu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd331e7e3---84564310177.pdf
    • http://qiuyutv.com/userfiles/files/20210607091311.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e9356434---nimupuk.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cad7d6a8d829b83ae14eec6467887c4b/dexoriwubojebotalaru.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1o3lpjbgj9got5ks2e92oobn5k/98754251261.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_off0000f5f7.bin
38bcc3e0decc2ebab72198e73d5591d2f4c76a8fc2e4127da95d58323d12ab78
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 16888 bytes
font_01_sfnt_off00012219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16792 bytes
font_02_sfnt_off00013a30.bin
48286779d8894fe7abcb8a840f36cadcc6a8e09eb43f2856d24eecaecdb80c02
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 10576 bytes