Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22d52a7dd50af10…

MALICIOUS

PDF

94.9 KB Created: 2021-06-26 19:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d6192cace4e51af7fe876304962711a SHA-1: 06f71632995dd55b96d4ec94bdb64fafe3b1b496 SHA-256: b22d52a7dd50af10aefbcb38c791aec410199382d15ad4bccdf8ee3b6056f943
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution intent. The embedded JavaScript is likely used to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://scheidenschiedam.nl/uploads//file/30403926432.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ssv4js2v0f3cmnfv5n8kvokr0v/zovewofotosezawamawinad.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7ce10cfca69cb79307ebba7180768ec6/kujitagabezorupamefuzupeg.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cb27435d---jotadopijemovumizabag.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ggps2qvvvvg629s198csmmdfp7/vanifevikefivetasip.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p9chd42eqqdqf0fnrp327c5ju4/35211974696.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5d64fb27a35702200add856a3d51eeb7/5326501136.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8e3cb4a0---73500832843.pdf
    • http://tscyw.net/userfiles/file/20210619002827_gr6lei.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40893785dd---62981563087.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3c4535d6d18124b607699da71a52c4e9/14854958547.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/74798278263.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85ff37280---mutoxenavefefabarononedet.pdf
    • https://ekransamara.ru/files/bebomubosozajowusoxa.pdf
    • http://myblindz.com/fck_user_files/file/detul.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9afca2db---31880483559.pdf
    • http://bagiez.com/userfiles/file/tewuzumewegut.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bbbe34468---74543035204.pdf
    • http://mega-gold.com/userfiles/files/92015755468.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6p2dg0vllob2khqfuss9hgak07/vosoxogegatakavunef.pdf
    • http://grandrosso.com/js/upload/files/81741595145.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/wurez.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad014355863---79872331503.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=notes+of+chapter+nationalism+in+india+of+class+10
    • 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_off00011047.bin
d221b9291061ed49813ac511b4681ee3f0fcf1c1a79fa7163c78d7ef66016a78
pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16996 bytes
font_01_sfnt_off00013c7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 16792 bytes
font_02_sfnt_off00015493.bin
4daec7169a7a5aca4ae240670a9d43600f38a9b6946691bbe28bca3968508082
pdf-font-stream PDF embedded font (sfnt) at offset 0x15493 11036 bytes