Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34f07d58e779fb6…

MALICIOUS

PDF

99.7 KB Created: 2021-07-09 10:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7490a40d9ffe562e952cfdee99c325d2 SHA-1: 4ba9bef9acb0caa279148ceb4b67a9e6620713c3 SHA-256: a34f07d58e779fb646141197b8d2d63983c1e0eb77427db2451f3bbf6bc96a03
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware delivery, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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=cyber+awareness+training+army+answers PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/801c0bc7cc490c9db5fccae8ef6d2c53/todugonizodemopizuguzubo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/34548431047f9c40fef36d877b5d2101/45483265688.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jcrq5mli25b10524slj53pvku/69564022093.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/74748028173.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kabevumijezega.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bac2a95---tamakosuzetinuvumewa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9c039219---81320011518.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607321e182b40---kutaregaxagelexepavewupez.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0aa515f1---jatoxifufamogipibupivuna.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/wagumuladinirerosumuda.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/96358850117.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71a245a4d1---50138850971.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5d89478c575278f4e617b37033595faf/xamukikesalajasa.pdfIn PDF document text
    • http://rubensova16.cz/files/file/vixodoxug.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j55q4ib4lflmgaoi1v4sep1cn0/deturofudadekewiwugez.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4369431ff---95127614191.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/bazurutudovugolekimitesek.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e38ab28b97899584558481de5b798635/jobiwejagusimip.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gamugasuje.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1ebcf43d---93905733158.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/857dcbcbe902adf6870304e0c9999492/23929260068.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/13234255448.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160966311c0072---gevadofabe.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/36772849516.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/75930839908.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/48359011294.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/fijasozufamidabod.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_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 10656 bytes
SHA-256: 3908ac5391f59bd6d282fb781dbcb52057389d9dc8013c395965a18dc2b653cd
font_01_sfnt_off00013b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1C 17856 bytes
SHA-256: f3571a01299983e6b41b472a3158c7771f664b8544ecb3a937ed32954a81b174
font_02_sfnt_off0001691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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