Malicious PDF — malware analysis report

Static analysis result for SHA-256 127b6043658f58d5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 20:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e1c523494cf9b4713663c93164be257 SHA-1: 85c2de9a45a08c5e926820b1c8724613c620786a SHA-256: 127b6043658f58d57f63f16031fcd365f2379d29b8fd0ffe36aff812bfeece34
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as potentially compromised or disposable, indicating a link farm designed to distribute malicious content or phish users. 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 0.9978

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://mfcpavpos.ru/file/dukolelixizazimu.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/97615989490.pdfIn PDF document text
    • http://villkasz.hu/editor_up/80820627871.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/90970233229.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/xeketonukifa.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/nelagudesimuwezite.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rimitovoxedev.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c017a6de2---67788294787.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/42257174042.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/wefigigaralur.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d31d685b87a2d218f08976e4308ef339/piwofu.pdfIn PDF document text
    • http://momsystem.ru/public/file/15895350342.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/77723913331.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/16475225961.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/53976120838.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/74e7v2p1hm47a675jg2bqupll4/75372061865.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/38895070609.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/3860091598.pdfIn PDF document text
    • http://temple.mo/userfiles/file/5052857561.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/54743118028.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/luvedukulumatajara.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db102e23f9---tesogaradogomekalifinipi.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/wumigobafuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anesthesia+technician+handbook+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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 10784 bytes
SHA-256: b52aab33c66286d832f1de49b2f9a56b8a64bc059f27caebcaa2cfe14db912a0
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16872 bytes
SHA-256: be52ed476e0e6e473971c6a3dfa20b1d2238a4555c0c8a21237e1a4afda1e830
font_02_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1