Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19a531f72956bc4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 01:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 942ec70c6d17cbef14f516cff57e1e5e SHA-1: be79a6dacee7ca6f4bd190850517f2da941f00e3 SHA-256: a19a531f72956bc437e44ac1e35d6ebc57995813bde3c79cedf7155d79547a45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest a phishing or scam attempt, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=adobe+pdf+reader+software+for+windows+7+free+download PDF link annotation
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/11001889144.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/29126998921.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a58cc9bee---56559019370.pdfIn PDF document text
    • http://scro.ru/pic/file/83532731634.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/87487841703.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/misuwigosalarofobokuxofis.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/12706862795.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca84092e5a9---zobufegomepipa.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/68450698347.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/a6bmhv72d2rh505733sorpls1g/bamejubixotusul.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nvhdmijscvs3ijfn7k1sj7grg1/mojov.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/bojeg.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/34225480441.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/lapopasomojafosut.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829be244603---43318661191.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/zijulako.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/bf14bf8f84ee50108d7cb60db2f0622f/wiwufenijavotu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f111465887d---87426903648.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8990baf561---31628588523.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612900ba746c8---dizutasuzejunibozo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160887bfac3578---91844235103.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56aec2f5a---53936314613.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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 10748 bytes
SHA-256: 336fbb76801ed9ce244399966fe63fa4f8020f5876470ddafc850d58bef0e73f
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 17108 bytes
SHA-256: 3131868760cf8d1b7514f6f5fb1c571d384cd34b1f1c487e11f7875b3657da9d

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