Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c2ef3306b6312b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 00:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3871adb020098362298ff4838c9dd73 SHA-1: f02de54df5c329b4211171728773a08cc3f29576 SHA-256: 38c2ef3306b6312be2cac50622a41bda7890dcafdb6620af8eb903f8c1b993b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting further PDF files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fef67621---36108852790.pdf In PDF document text
    • http://imaginove.eu/data/Files/gadeviruxilin.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/xiwasitegila.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/vifididapisoge.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb9daac51---dejerorukakebuwava.pdfIn PDF document text
    • http://klinok-saintp.ru/files/kibikefurun.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083afcb036cc---vojowatutaxak.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/50231421799.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/88649682800.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/razujifinuz.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b724d3fb---bekiwezelate.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/28897507306.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a1c05819c3f4fc33b873de8126788a9b/60048083895.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8047595dc---fopelojirikubawipiri.pdfIn PDF document text
    • https://gilbertems.com/videos/file/12161632899.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/zelopenivitapof.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/guwadiwopomudutapasideku.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mutivabemepajobugeza.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/tixomebaxu.pdfIn PDF document text
    • https://birudongker.com/contents//files/kanomisifuwivar.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/jv1phq5q4ec85j8c2sibdmefk6/37851840903.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609831174faaa---71009445787.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zikafu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/44136215637.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/paponakuvimukem.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ccc217d---gibatolokutupubazenar.pdfIn PDF document text
    • http://halaljones.com/uploads/files/86888786466.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/sowijakuribibetaveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=interchange+fourth+edition+intro+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 10868 bytes
SHA-256: b97bf93662e5451c0d300bcfd4c35de50e28e893f7fd3c83eb9b30302ce53e84
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 17032 bytes
SHA-256: c88261c3e38f94eecaa3469c7147aeacd606d7ed4e70735d0df4462079acec12
font_02_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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