Malicious PDF — malware analysis report

Static analysis result for SHA-256 424d2ff9dda5b419…

MALICIOUS

PDF

90.9 KB Created: 2021-07-19 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 583e7b739bb8e24efb43eebce2c44e6d SHA-1: 8616682ff03994246d3f5bf929e8f6d4abc22ad7 SHA-256: 424d2ff9dda5b41952922c3bad5762d19a38f4f46f3fc04509d5ea9d6b72b72a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ylgems.com/file_media/file_image/file/xazazorilawatur.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607478961ddd4---87428865783.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2702f27---fozuxeguvokowas.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/4441553224.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/mudozamalusifiwatuti.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kirox.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lomapudenivirixolumefup.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/ribijonuloxedofimadinejuk.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/98210953857.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077af4c05be3---fuxakirebudebisid.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/96965970567.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/81413867183.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/lq58u21726r3n5knm2ch7joec3/soxokokavupojamepol.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wekurutifiwovizozow.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ab8559d6---xatuj.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qp2uedd3edphb9duqdpjnf5qve/25566943377.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jazireragizizowogeza.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/59101433242.pdfIn PDF document text
    • http://ha-sine.com/d/files/mizaverepibaduwur.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/n0igs78r4f1r3q33t12fvs377r/58761043885.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r56o497t0tfe4i8ocq7pjbumjj/xulupafasozegunob.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/pojawetopejifujojuvoje.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85c4bcc19---kajexiwofaragulukefonebib.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/00acfad76563f235ed3caeb605adba14/83655980637.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3792807132e8cb3ecf2c2027491db3cf/50941878221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=thick+sticky+bloodPDF 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_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 17800 bytes
SHA-256: 96dd7d43de34f421d99a4b92c8926fdf48d51911cd64b6fc93ff8a2122caae48
font_02_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 10280 bytes
SHA-256: fa1b69b4a4f3e5040ab90e07e3e45962b625437872b281a528153a8a22a2db36

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