Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f8157afd481508…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 19:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3db184ab468b9e41320ecc2bc4757806 SHA-1: 8dc22ca33d47d81afd1220cce65f5371a19fae34 SHA-256: d3f8157afd481508fb2b0e8c4de3dcec9e197e834789c7ea2521d5dbc8a86e2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick the user into downloading something malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://crysiq.ru/uplcv?utm_term=watch+wolfwalkers+putlocker PDF link annotation
    • http://gesundheit-im-blog.de/userfiles/file/68739364542.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kawonetowolekeralojo.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/zulofomokojimidox.pdfIn PDF document text
    • https://phm.vn/upload/files/vofunumovojugisozu.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/40138050086.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/daluzutirilikazi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d0a1f5240e1f5e5edfee83a747ee0466/vulodapowunedi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/47785454192.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/degisibopaj.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/larejijut.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/mogabakugumi.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sijuwopobuxevemij.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/15949599776.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/fovefe.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/4262195396.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416c0f1d8a6---5916639888.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210917112438_978334912.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/77985004127.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/48667399464.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/40268280178.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l0hcsddnfgo888cm8ofvgk9lm4/42050297733.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/82444737203.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • 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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 10652 bytes
SHA-256: df9786b2ea86ff4bd95ed6cc44c79f6df26fb59dc90828fc416e71869e7d7e7b
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 18736 bytes
SHA-256: a86f817297894154a583e29a5c477e43e01293990954380add053fb533223f1f

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