Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0df2bf63d4c908…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4323ec9c9e16e7163078465cf749d88e SHA-1: 8440673691a85c3df5af819b18d4da77a2854300 SHA-256: 6e0df2bf63d4c908c586b696e6713ffb07d09f02df9eb992c1423010dd37ac6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://ctapigroup3.com/contents//files/42286479563.pdf In PDF document text
    • http://owv-sad.de/userfiles/files/69401808294.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kuxoxazasefop.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/5938345074.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/oi20n0o5eet5un0vl8pfkm90b4/tifofuturad.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb46c2de5e---loganuw.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/rupexiwak.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5db7011b30cb14759e55053a1c78eb4c/gojimo.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/telufazenijirukusenopotez.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6ffa803a8e4847b51de51c5a7355aace/49770363847.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb81cf74857a09810749db526a96bd5d/zakiditinaruxup.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/bobiz.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/ratajosivaridoz.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/88673916075.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/powijumubefejoduzajawar.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/26796243874.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf355a2bb31---51061198601.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/4585937966.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073deda06a24---19003996335.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bozeman+science+transcription+and+translation+worksheet+answersPDF 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_off0000b8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 11072 bytes
SHA-256: 1a4878d5a27fccfe982282ebc6f49bcbc4a84893be198984d7a4ae6d57c10bf8
font_01_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 17316 bytes
SHA-256: 4f443ea952def9b88490da5365de240db770b4528bc7df6220c423fea9bf9827
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1