Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa81c9a2ffc6249…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 20:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84ccdd96bec81b4d234b85c631af8380 SHA-1: 9e2508bdaedfe0281eccd07f3d08f0285f3d74b2 SHA-256: ffa81c9a2ffc624951b7ddece0b035d27dfa10a1289fda317e70bdf2129bdd45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://orhs76reunion.com/clients/30721/File/fuloviwuroso.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160710dda1b0c0---13585492968.pdf
    • http://syuncyoku.jp/upload/file/96074980462.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084313874839---24544492101.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/40472339937.pdf
    • https://agenziadiviaggiocagliari.it/file/86173951194.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/240e43eddd691263c80f4816bf733bf9/likizipuf.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251605196a---vusifusen.pdf
    • https://songod.vn/uploads/image/files/raxurof.pdf
    • http://curry-box-deluxe.de/userfiles/file/75392348321.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607007f9dfece---vovagozus.pdf
    • http://cuspsurgeons.com/userfiles/file/jurodekum.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637b797f25---31183192599.pdf
    • http://ufnk.fr/app/webroot/files/file/31042559442.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8a3c1a37b1aec95e52aac89cbcbef236/83160205642.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acd05261a74---90431402266.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098970b9fc23---11824619423.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244d226389---5030024485.pdf
    • https://mollis.rs//files/47965043252.pdf
    • https://turbooto.vn/upload/files/1710711031.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d13784b17e8f7f2899754c7e21b2de37/radamutoruzunadaputivose.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=are+stars+visible+tonight
    • 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_off0000ef54.bin
1fd95bf5367c65e2b7399d8cc749fe5aa08ad8c2ad4067ccc98327fa5e6227d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16820 bytes
font_01_sfnt_off00011b45.bin
cae7097ebe4e40fce068b277fe6fbf20be9fdbeb53bfc61700aece0d9b040a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 10576 bytes
font_02_sfnt_off00013362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 16792 bytes