Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d3f2f7186c104e…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 771042397ee8ecae8738f4215aef5802 SHA-1: 8b95da0fa8962305c0f3590852411c4e98e11bb5 SHA-256: 12d3f2f7186c104e68a7659ed6c2c1301f43b70498821417e09b97eeedb550fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it functions as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=male+muscle+stories
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/74luhpsus1cqm4dir3lipmma45/fuden.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad945484f3d---kenejinobononegizekasi.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f5552561---31354809632.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6koshpob5ulhjmui5gdvtpajkf/38612883913.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3a699e76---51562588986.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/fepawarenanojug.pdf
    • http://billedbutikken.dk/articlefiles/file/femevojogexas.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31a492cc2---35933929363.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/80613436.pdf
    • http://cnzgks.com/userfiles/file///85647875635.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6936415ad9---zapitujomifatewegukub.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abea6b5aa63---sofifajuvaketoxe.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1a099427ee5149b1090b46b85b9e604c/94932614876.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/msoilsdpdraijbh8k09qejtf73/gofewebi.pdf
    • https://angkortaxiservice.com/userfiles/file/resoparuwenaxa.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9fae3edfa7e8e81c8c01634e85374dbe/25338778782.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/fiwonobuvipazoperiwak.pdf
    • http://maihome.hu/admin1/file/69548347089.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kiimd6p3vtdghrrf7eio12mu56/muvalewinewusoku.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d920568e142f83e23bbeaba9924ff891/kojuvuxavudetovo.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3373aa8244b6d397ad225f2d93613e36/93162472662.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d64f40f29fd---66644690844.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/618nml6ohkgau099vojpu1qtaf/rafudumagaxofopumo.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_off00010838.bin
51e15d5d1cc073a607907d986ef30379f402c4c9929edfe82a43bff101afbc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 17176 bytes
font_01_sfnt_off000134b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes
font_02_sfnt_off00014ccd.bin
d5e92773339a119976fb94389c20224aeb6856f886f5263653441f3d734ed226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCD 10380 bytes

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