Malicious PDF — malware analysis report

Static analysis result for SHA-256 721521165f0e1c71…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 12:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6208d1958fb7fbb9113491806419fe55 SHA-1: abe8e7fa09fa419b50c1392ab8f70c5ab532f770 SHA-256: 721521165f0e1c712513a2f4283398e6664a7f7bde97afefe22f6d8264aef3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea86a59a2f5fd0c002dec74d22e1c3b6/puzeg.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0a7660362e6984c54d6b10eb821761bc/80896248620.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b990fb94c93---nigugewixulekebova.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24a488a34---sobufex.pdf
    • http://yoron.net/up/files/gemeridetijovigixi.pdf
    • http://igorodstore.ru/files/userfiles/files/karefobodi.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fb6f8gk361rae8ksr5au7r84v7/bexevetinuxugu.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2411ccda---11564898200.pdf
    • http://caratow.eu/userfiles/file/runimun.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/daletilopamusabakesoziwo.pdf
    • http://jatyn.cn/upfiles/202106/file/1622632288.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d2d86c34f41c8c68b375cb78c6f678cd/mojot.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d2c9bef9---516814283.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/jumarinuwepodezav.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aenuli2sknd4rufmqtt2mbtuhp/raretafipiremiwimu.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ecfa5216---rekedulu.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729afa0482c---ketexazakowuboruxilanij.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/21f9cd86c50c7e8aa478efd2805e3cfa/76472908028.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pg7cgab4b15tbolakjk16gdpta/bewijet.pdf
    • https://nevisnews.com/userfiles/82648799050.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160767af758683---walewosebaxaba.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0669f26b3---92981979311.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/13bfcf0867acfcf9ca50d154693267d4/jamanavegafamipi.pdf
    • http://www.radanhorse.com/resource/files/gogavatabefojuverimib.pdf
    • http://gialtour.it/themes/userfiles//files/26691242598.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+bollywood+movies+online+pk
    • 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_off0000f2ac.bin
724fc17fcb6ff8464c81721bc1c9886744180a497a76abdec3eed10937e156b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17088 bytes
font_01_sfnt_off00011f39.bin
391b2684ca098c2b32b208eabdd6740b6016b39aae93be4e8f45a6b30a377323
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 11168 bytes
font_02_sfnt_off00013910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 16792 bytes