Malicious PDF — malware analysis report

Static analysis result for SHA-256 357fba3c24109fd9…

MALICIOUS

PDF

70.3 KB Created: 2021-10-05 17:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92556530dd3798faa12af3c1a5987714 SHA-1: a068260d951c2af0579bba03845ef704f9c62a6a SHA-256: 357fba3c24109fd9c2dfcc444ba08b053030e957a06953281ba5af3022a83395
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142491194951---tisili.pdf In PDF document text
    • http://newtarrytowndeli.com/uploads/files/55618541651.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/63356937189.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/62000237331.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/39893943868.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/wofanotegebuzid.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/11795133599.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/vugek.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/fubilexibitomizukukuje.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210911025747213.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631197861.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/fulepejifaw.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/zomawag.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7217_20210928035847.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109221645015034.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/37156918993.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/mefabarejebikijebepegoti.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/bosumiw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161450077b155a---xojifofabeneloropekifaba.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/09362f954ac7b97a449e3b3bb46ac3d3/11746673796.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/lafimotubepeg.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/71eor6i3gb8ckkr21511t98d2n/81185140343.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/94527896026.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/95555216423.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/11155054774.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/41181833212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+a+pull+stationPDF 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_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 10208 bytes
SHA-256: 2f1449bed79db82f12603b3a315d0ff1a50c9d713410990f63dddb8be2d88a8c
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 14508 bytes
SHA-256: 5d7aa330b2879827b7bd629a11def6a7a565be58bc0664839fc377a52ac88af6