Malicious PDF — malware analysis report

Static analysis result for SHA-256 4620aab7cc9a208d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 21:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ad352d2bffe036d1beceb4186d0ac4e SHA-1: fa3aed46bb55dd931778871693e0b792b0e1148d SHA-256: 4620aab7cc9a208d872f87ad0e199ab68acd92c900290557cc89115a9cdb1dae
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=android+stream+deck PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccf4ddc57---54907042816.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/2633980998.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tasekemili.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/94290597017.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/dilotar.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/78876378402.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/87451310539.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/luraj.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210904/file/bevazimazajap.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/86543208518.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/46nfu82slho9ga31g5oitf24um/sukefifuguxojulabevoxatof.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dawafonot.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/menetujilafidomofevoram.pdfIn PDF document text
    • http://bakoca.hu/files/file/madezuvefopidibenet.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pomurivifefekirerufu.pdfIn PDF document text
    • https://rippa.pt/files/file/61622761631.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/gokulisufevorumoki.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161347dcd3f551---50332753641.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/xoxonamijofifur.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/pifawedeziruninujinowu.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/79273024467.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_off0000b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 16428 bytes
SHA-256: c2a816624d6c8a2341f945e83d748d74c645794101e940c04542dd0e43729b4d
font_02_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10556 bytes
SHA-256: 01a6d510d3c39a86e4c7afebce02c218afa4f36e62c4b1080ce17561ad67a1c9