Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2bfef1d10bf3e3…

MALICIOUS

PDF

91.4 KB Created: 2021-07-06 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd271c910ca3de3e4a85307137a2f8a6 SHA-1: 8410a1263e3b3d916f802da7f95a201d305194bf SHA-256: ed2bfef1d10bf3e3f1e0e4cc99f91a9fbd1e7f1811e17ac75ff09c4303754dd6
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains links to compromised WordPress sites, specifically pointing to a file within a formcraft plugin upload directory, suggesting an attempt to host and distribute a secondary payload. The presence of external URIs and link farms further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://peterdegendt.be/file/28371636006.pdf
    • http://instandee.com/Images_upload/files/dufazetidorujaza.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/67cvsvrj42f50s5eee26f1lsh2/zomugamozefagukibawume.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oqet01ahvlcmfe353e3faepcu/58486399615.pdf
    • https://afra24.com/basefile/afra24/files/46274767996.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fca199139---sufudenabifusepuvanor.pdf
    • https://annjulieskarpmo.com/userfiles/file/19752709729.pdf
    • http://falerisztika.hu/tmp/gagilufixunelir.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ca4a84a0eaba048f38842fc40bc26145/tomilowizupafisiwejedakak.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/a7pl171tgqctcknc6jk99qt693/letikit.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3oi4spkmt2rq0cnu679t4c500j/13571413431.pdf
    • http://etpatatietpatata.com/userfiles/files/bugolewibaw.pdf
    • http://iphysiology.ru/upload/2775803461.pdf
    • http://aarogyamedico.com/userfiles/file/34760820173.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/be3eb81d1abb7317c2a4fbb58445de49/59929329700.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ims0j816u37hvmnva48tkn3va2/tafavijobotadazujatupu.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c0e277b9---64402271163.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacaaf154fb---76738781013.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1c6ad6568cbf8624d87a86a3367f071b/vakipofikipibazogozawilol.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i2m9deicdvj39ek75norduc8vp/2315492515.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950c89b688---fezafikilajusasivana.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dlvmspdbjp1h3n99k84dgklav1/fiberogorajamojo.pdf
    • http://absolutelyneon.com/userfiles/file/kamomamawulitubabolawema.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/34a53ffe85fc10cd3c510c3c632f8257/14233202503.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=texas+defensive+driving+course+quiz+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 16792 bytes
font_01_sfnt_off000101bf.bin
100d6fcfb77d5e4fc584c92687a18bcf369dfc0569a9b22c4ac600f6e80398ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 11032 bytes
font_02_sfnt_off00011b21.bin
9efc606a1a8f678d44eec91ed806b9a7ce574a1e344d7d253371693584c30810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 17700 bytes
font_03_sfnt_off000149fd.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 16236 bytes

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