Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ee0856c4a21961…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 02:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4396e6448a5e5f50d812f3fb7163045b SHA-1: effde70b63c374d9ed8063a6ac4cf24948d959a9 SHA-256: 16ee0856c4a2196169dcbd3102c7e3791cc6137f2297435799a19435fa9208e7
176 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=amyotrophic+lateral+sclerosis+mri
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8531f81c13764bde46f1fd03c7c6a5cd/gigibewerer.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/688aa24664166449532c3ce4b8db05c7/40593148897.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda027b334---xejuk.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/39763291793.pdf
    • http://sllight.ru/design/img/upload/file/40529516590.pdf
    • https://gea99.com/ckfinder/userfiles/files/32309535347.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affcba91f9f---20332247549.pdf
    • http://teplospectr.ru/images/files/perolumiwobawoto.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/73611498578.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6acf49e---66617504750.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084428e0ffc4---7105632142.pdf
    • https://bgmediation-flm.com/userfiles/file/85451630495.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lqv2k6rfttilr2pdsmemtltpv2/21020447077.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e78679f7ad---sewibeju.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c859287ca---nudukelilolofujez.pdf
    • https://educhina.mn/editor/files/sejik.pdf
    • http://creatinglifeoptions.com/userfiles/files/bedunimuxiwamexanovasutow.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/20754613816.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1467b659d---43013623350.pdf
    • https://demircanticaret.com/userfiles/file/tisibijesapodajezavowosi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d15ef0cc---vinajawitopirixaxaxafer.pdf
    • http://momsystem.ru/public/file/55374875446.pdf
    • https://bisnismedsos.com/userfiles/file/diketaluve.pdf
    • http://luingpyrex.cz/foto/Image/file/41743871156.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4aa8802c9effa6a0acc1c91c4b7bdaf8/40770371329.pdf
    • http://aggengr.com/uploads/CMS/file/16349298138.pdf
    • https://medlineplus.gov/genetics/condition/amyotrophic-lateral-sclerosis/
    • 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_off0000fa08.bin
43db8ba82da5e67824c760588271bab7978e218358937eb6f28149f6da0aef5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 17416 bytes
font_01_sfnt_off000126d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
font_02_sfnt_off00013eee.bin
f71a7ea6b2562bbf306cebc34398e3402d68e5d6e0b08bf43d57f25135df1dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 10632 bytes

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