Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30d315f91db3523…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 10:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f35f55414bdf173310bbbec68e0c1322 SHA-1: bd41e1036ac5bbaa5bcd1f7f17c62dd1678c48d7 SHA-256: a30d315f91db3523a39675ece639482182ab4d1deeb5f574fd9d6da3c5cb06d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links pointing to compromised websites, including WordPress uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=dissolved+organic+carbon PDF link annotation
    • http://brickform.cz/obrazky/files/14666705977.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/jawixugibikowomanafevim.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rekalijuligoxavab.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/drdv8hml6rjtl7qujp0rqc2553/wikepikik.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/191598540.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/58297851638.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xesufaluv.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4a8ca28d---62274437747.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/60223245941.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jolixovugutesose.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gepexogebif.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/tebimoxufemusamugova.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/rilovegu.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/89518604307.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/zagafipokaliwowojapego.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/parekutodebiwotajukonis.pdfIn PDF document text
    • http://dmkert.hu/files/file/82268135247.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109141748444533.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/18933488925.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o8h0ndevv5b7h4g28brn7upkku/bojil.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/monaneresifikatebizodino.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/46154577384.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tubiwedezetitak.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/xagupufupemogemuzajevure.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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10656 bytes
SHA-256: 977602a38dbb6c50d60ec928507d0ba19d734f10ede2af965d0e398804f4cc3f
font_02_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 17176 bytes
SHA-256: 075fb0f3ee2ca0b6e4da31806279d7401c9a3d073d5ce16259eb6c46e90bb963