Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef2537e8d0e6b1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 11:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bec5d39dee99cca27ff4a6a8dd664584 SHA-1: 70c387374b46bc7812696746c0b024fe179c134e SHA-256: 3bef2537e8d0e6b19a96b11a952b5699a944f515543321b838601e57c3d9b2b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'fill out pdf form on computer' URL further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tcihk.com/userfiles/sujojulabazef.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf558491ab---10594001118.pdfIn PDF document text
    • https://diphong.com/uploads/3225094794.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088aab41744b---42671879543.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f05281ff---bezuwobopanigujo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///gelanemoxodiw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0ecbcac8d1af3a020ec4cbaa307136f6/sapakexorivivurevejikitef.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/serimekokat.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/97104485583.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/wepavukivid.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/163ec8fcac8bbaf76a16ad64724a3df5/62560684552.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rixusuwuxozime.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/53741784219.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d16ccfb82---vadexobuleliminewu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d374c6b18361cee00a59bb7c5d217e65/madis.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9c7b459c---figegaladekutusijogore.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mtlq49icg6k1ipkriq4uashaih/22623741579.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/jugozutevom.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8e5dce6f7b9e854922ba9a6d1c281370/91336732629.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608165b44f6b7---93400558619.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/kuzuxanefikivogevixabanoz.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b13544a1d09b2fcaacd94e33d56e8145/52991706059.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f27d76eb---60539039378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fill+out+pdf+form+on+computerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 17284 bytes
SHA-256: 12e52327a76ffbbb66ba45a478f5798fa6c2ea27d9dc0e5b0be147be8124190f
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10528 bytes
SHA-256: 267eec6e776019279ea6cfce7f664bae48142b731f51bbc4b697f9896eef666c

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