Malicious PDF — malware analysis report

Static analysis result for SHA-256 a488c792a352171e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 22:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad3bc9d9c76485dc0ca3d4b343843fec SHA-1: aa6a5d83a88ae5e936c3488635ffa7fe59f6c0f1 SHA-256: a488c792a352171e96f7b9912c42739c1d79d8d017eb3cb93cd2961a638c6468
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bff61a2d5e9---wixowoxuwir.pdf In PDF document text
    • http://softtox.com/new/userfiles/file/gufutijenokeduvono.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nufajumafidokadulus.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/bonil.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/turabatabijizajutuwemixed.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/902vat73jq282sfa9ti1dpbvm1/82523281832.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vuretumutuvi.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/falagen.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gepejixepilivezaxujuteku.pdfIn PDF document text
    • http://packturf.fr/files/40519426545.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/poe2e7fn9dsp4bl29j8859e2m7/widizekigaligibowajizor.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4b8b5984d5d22b971dde2e7008903227/dasef.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/30949394308.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kavunuv.pdfIn PDF document text
    • http://dobermanncz.eu/files/29720795171.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e1f5c7be---6309960654.pdfIn PDF document text
    • https://plasy.com/uploads/file/14445397736.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cf10s8e6uqol57qjr7ub7fgj5u/54412026677.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41f1dbc7f---37582542054.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1a012c4a---79119379751.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dutojaxebekulatujipinegar.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lebadojanonuro.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eec121d3e---zanimotufujaguditorigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=methods+of+calculating+national+income+pdfPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 17444 bytes
SHA-256: e90d99d9e60b335a01305905b24b2fe6a5e15ded211fbca8b1499da4f66da3fa
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 11060 bytes
SHA-256: 0374c096e688132659f248f953567d799476949d0164891607a5b4e6d5397906
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1