Malicious PDF — malware analysis report

Static analysis result for SHA-256 d025124833d9df55…

MALICIOUS

PDF

96.6 KB Created: 2021-07-26 08:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3966f6b3ba359a793551ab34abbd5a93 SHA-1: 75ae993c9b7c3515a82ebe1308b0dcb3cfed045d SHA-256: d025124833d9df5567aae5f53dd567fa0bbfb822c1a81a9fb8b13cf927b77dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://gullyracing.it/admin/ckfinder/userfiles/files/21689801625.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbfce1191---dimoj.pdf
    • http://keigan-productions.com/clients/863431/File/26621700478.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/78943838822.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074260a8c7a3---54281115010.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca7e60d1e---58509720073.pdf
    • https://angkortaxiservice.com/userfiles/file/44628575155.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3025bad80a982d96d6986b3584b959ba/joxarinavomatagegorijok.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/dijadajipotulonawagozi.pdf
    • http://gdbchurch.com/clients/43262/File/vubuvubujuwojitovozivuvo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f963ac04463---79656106031.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4fc7d991cba40cf867a30491967c5c3f/52339751171.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d240450af---bonoguxive.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097efe0f36a7---xuwupalatek.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f0b22f326e351cb3944e045ef67a446f/13650848183.pdf
    • http://skogsformedling.se/bilder_umeny/File/61449591999.pdf
    • https://xo-sound.ru/userfiles/file/tuzolapogosu.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076713e1be4f---19864056008.pdf
    • http://terhautz.com/upload_files/files/vebatogev.pdf
    • http://unseenadventure.com/userfiles/file/bojewowaradoxog.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fefd1fcf---babesenodib.pdf
    • https://seikico.net/img-tym/files/51453306926.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160839f6a96456---jotapobekop.pdf
    • http://archetipoingegneria.it/userfiles/files/daxikudepavonefide.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+teach+english+grammar
    • 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_off0001175e.bin
e5a7963d48f5366bc9b15452d163ae649b137bcc56398303f266ec6e791f8c49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10752 bytes
font_01_sfnt_off00012fe9.bin
311c12cd25dd6532a8267141f2ba1f2db7156249ba94252cc427a425d59dfce2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16832 bytes
font_02_sfnt_off00015bf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF6 16792 bytes