Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba4ac6523c3f0e3…

MALICIOUS

PDF

104.4 KB Created: 2021-07-07 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63c6d7b0fa4367e7effa21609e65fe6e SHA-1: fe7e178269ae172e5e9735bc1c1a17ca2279c429 SHA-256: 1ba4ac6523c3f0e3c79bed803a004351db38a98724d3141a1aa3e66fd7db3445
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports the conclusion that this document is part of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=what+are+the+reactants+of+cellular+respiration+and+photosynthesis
    • http://ajtoablakcentrum.com/_user/file/watukoxiduxikidexudi.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a774de100c8f66e3b86d83d6c06f86c9/11100920943.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/kamatibegubawevatolebin.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7f044c3df---60767120020.pdf
    • https://asset-books.com/userfiles/file/84614487552.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6afe38d34cccb72152ed093bb0ab9e13/tavujujudizuzerazedumifa.pdf
    • http://bdn10.cz/files/file/72181721934.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc3304389---wuxiweregi.pdf
    • https://fedico.ca/upload/editor/file/26525849433.pdf
    • http://kameleonhastanc.hu/files/file/86498889495.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607527c3526a4---57969375276.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/u5bjnvsfksqb7pt6d039dbeneq/legukonosogo.pdf
    • http://kayamedbursa.com/userfiles/file/giwigadomefijovego.pdf
    • https://suprizpin.com/calisma2/files/uploads/lejegagok.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d09fe58173cb38b80b0322103739df3d/4855806433.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b4e4d25e95e7c7ea5ded29f7294fba99/seluxasizanogulejapivil.pdf
    • http://al-bandak.com/userfiles/file/15392157617.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67b11ad3b---48766394250.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cadc10ed8d---gabipobevipaloxe.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f95c63cf28f580359dd70dcbb4a822de/97357939530.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7f37fa3a---4238975187.pdf
    • http://arniestribu.com/campannas/file/3441729314.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16792 bytes
font_01_sfnt_off00014cd9.bin
830e2c00180700e1fe3f8a500a4f7a8cee1a4b4b8b052e14d98b000b49dfb9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD9 17552 bytes
font_02_sfnt_off00017aa5.bin
ecba3127c60a1cef14700e06cc1c2ae8663936682a9b5734341ad0a2bc6fee40
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA5 10924 bytes