Malicious PDF — malware analysis report

Static analysis result for SHA-256 024322bc497e2b2c…

MALICIOUS

PDF

80.0 KB Created: 2021-07-24 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a60de33e13db3c0f26f867bc690d0e7 SHA-1: 874f187f19db69e2df68bb350648e13822171438 SHA-256: 024322bc497e2b2cbb44aa5e15cdc9b0a5c18b77a17d05e7dfa065d013064705
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

Heuristics 5

  • 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
  • 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://vibangnhadat.com/uploads/files/silibetavomidedovagabuwa.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/nofubite.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tozepazege.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/lagizanekuparokudapu.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/90861800156.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ef63bfd70391939eed52988fed110f89/mivoxufugonokenoza.pdfIn PDF document text
    • http://unsersohn.ch/images/file/16934398681.pdfIn PDF document text
    • http://distributoram.com/files/file/panusugoziwodusokubop.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b2d3da5d39286f10de8a61f9c79d3670/dixinotidirepivelejevovuv.pdfIn PDF document text
    • https://aneri12.eu/res/file/78341828042.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/89885408859.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7855d9d26d---10176078644.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703d52d127---lununubimodojogad.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/hdpef3kcbe5k8atuacfptg5kcb/xupumetosexubikumupuji.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/55535353281.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/17479720960.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pedaligap.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df0ac4635---gamerufixurelamubezizojo.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/vexakepiri.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1da3009508be8634b2f48e66ff0383a4/nujupipoxizigexivuve.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/52b902d746771cd73e1efed660ccf213/95371690642.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sijazixuvefumevojo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/99415684885.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/52691924854.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/62433725075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+the+bag+in+a+munchkin+diaper+pailPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 17948 bytes
SHA-256: 9d44343419d41b19dd7885eeee84003b96676ca72174f5bb3a9f7865b82c300b
font_01_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 11200 bytes
SHA-256: 1bba3c28aaa6f0a80291256cb2a741a4e2f083c105a77ab829ffb9f45c160d36