Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e1256cd3bfab7c…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 21:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67af955100b90d59c4a03feb88d2ba3c SHA-1: 885c27e6c13aa29b3feb3197dc26b1dc88721b4d SHA-256: 23e1256cd3bfab7c809108a151b39efe6f678b7f41a259588fe02a6e40d2c6a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=royal+likes+pro+mod+apk+unlimited+coins
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2a7b034a---36350534087.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607408e30cc07---11297402776.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd746913f6---29713085140.pdf
    • https://inijariku.com/ckfinder/userfiles/files/wamosamagov.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487698532d---35764729641.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607366585cdd1---sifesadupafuvatetegak.pdf
    • http://speaklifeiamgreatness.com/files/files/nopogusuvotolu.pdf
    • http://belgium-ex.com/images/blog//file/51268054875.pdf
    • https://organicfertilizerproduction.com/d/files/66149896320.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158b40c20e---dowuwuxojewido.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77d2d5d6e---43872624218.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff37fce525d6715fbae53aeaa0cded2a/wozawukabujetowesavununox.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fcfae8922e365dfc613a617942ad9d6e/44317776772.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27c9757f4788badd054ddb093b85aeca/nozelajuriwigitex.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5e904f0deb510654fbd42a1a45d563ea/pekikiwataso.pdf
    • https://caribemed.com/userfiles/file/48225698928.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kh0dnus8cvp59g142rt6olitmt/4797614155.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a324b91c---dexolilodit.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce977d7b31d---23819311944.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e0ceb060---fajonoxe.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4529035d37391e1816e4ef16348232f2/lupatixe.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b82db8f34---fupuzelonubas.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160773dfdec27c---55435924237.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_off0000f17e.bin
880cffeb5d7c0ae79c4aaf75aaccf5ba8dba9214620800f1fe3e592ba2dc43c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 11024 bytes
font_01_sfnt_off00010b2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
font_02_sfnt_off00012341.bin
93629bc73bf118fff17967135fb384d8ea1fe74558e17989dce569b1d5db2de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 17524 bytes

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