Malicious PDF — malware analysis report

Static analysis result for SHA-256 f019771a27d7b5aa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 12:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69a0a28350f73c58d26ee80278119dab SHA-1: 27559fc4f1500a8a2f28b6ea5ff4c5549d67977c SHA-256: f019771a27d7b5aaa3ac9abba6b74bc6666d304542b51a52543861e83a25ac19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple links on disposable hosting and compromised CMS uploads further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=volkano+blaster+bluetooth+speaker+manual PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec0dacf8e5c02b35ab433f85a3358e1b/bobirolubo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zevudukasulubixaliravu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4fd97mjr2d3s5pnitssjscsis9/63408123921.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wagatewuzozu.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/55483658358.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d7693ef0b41---98336650231.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/68794679488.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/96159916018.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/vubinosejipo.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/27529140076.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ab4935c3---50382816991.pdfIn PDF document text
    • http://fitviewer.biz/files/file/kolulakaxunetifolit.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3cinbb3corhorfup59fc7lpif6/gufegawiramuperedu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebae2e34bf---moxofiviramarirurewaze.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/bafanem.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db0b60f77---zaxomevotubolegibu.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/87105147771.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3dc67e90---suzexepobuxigonabe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/nlhre3e8rbgvs88sbgv2hve1e2/98445756868.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/38ee3ddee29fd5afffe8f0fce2e83820/93893234900.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/94225999908.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/fawepo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3494dbd96f---pabovepagurunol.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed90d8c1c0---84748496225.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f601605f372169a5e52e3d3d5ac4e577/jetuna.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16126f2db9dd05---17984313568.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_off0000c100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 10724 bytes
SHA-256: 4d441c6171ed36b04c6cd6e6755fecadb30f5961e65cb0331a9f45fc4135811b
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 17608 bytes
SHA-256: 943e9ebc1b038f2822e6061c9c10cae970234fa84370e6d0d74d634bbf494d27