Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadf7251bcec2991…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 21:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 770af5ab3cf11939f72c3b63c3c2def5 SHA-1: 889d646dfbf25d477172511f6d9088a54a88f997 SHA-256: fadf7251bcec2991c4f112d728f292496be420f70fb0ca4eefc49fa72c7995d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5dpi5rilj294o4t1fpmdr0bbhj/vudojigonenenenokulutakeb.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9c17e4cb---kurozosafabufinafup.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2a5f97a9b8919d58757286a46770873f/84403543280.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bc1564b6---fapezawegelesuv.pdf
    • http://perseverance.cyou/updatefiles/file/86163479406.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e0a1d10---boxobusa.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bqlsav3gaup8ndj18pe2l1c0b3/41526699925.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77e4077272---30206223977.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607187cf180a9---nefitu.pdf
    • http://cuuhoatudong.com/upload/files/pabonolenokigodud.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9a33910e---8296512676.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1jhnps5h5ckb4sub17a4evafd2/77972594026.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93d79cb5c---bogaxifejogebomudapajekim.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942f1398079---19840525555.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ed9308df---93833342984.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/02be450c845c17b3bab91a6b05b32843/50379111618.pdf
    • http://pi-consulting.ch/download/nebase.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/jumofisejojelazujujaso.pdf
    • http://gesundimjob.at/images/content/files/84634175854.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208f9ccade---surejuger.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300c685dcc---xirutaditedutiz.pdf
    • http://poorclarescork.ie/images/bizogivogonotamebuzid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+long+does+it+take+for+a+love+spell+to+start+working
    • 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_off0000eb59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
font_01_sfnt_off00010370.bin
60db613c6d4dbf3c860f452f52c90c251c860a36b35519c44fbe67cc14a1581e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10908 bytes
font_02_sfnt_off00011ca2.bin
f23a95f73d6ad6101f91bc2f5d6c26f20d79a1101bcaf76e5647c86d35188684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16632 bytes

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