Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75df814353cf6e…

MALICIOUS

PDF

73.6 KB Created: 2021-04-28 03:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2645102b411613eae534a21a03ddc3e9 SHA-1: 9af7db1765ce2938a16d69e19efbb3cd9f359f2c SHA-256: 3b75df814353cf6e1b40d77624f16d091cc54be03298851a772fa65d892cf1b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4c43888142b0199356557a4e21e2f432/robubokiwujubigek.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c5d0a5c3e4c7103ed96dd1e7a7c39ed6/19402165257.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vd36s7dqihbvgrhqn8kh4amcmo/1915529319.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6baa3d465e9b3a6e37c2bf01fbfb1111/pixupalizoribavufekeneju.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c92c47fe18db32c16bb0c546d1af519b/20836722816.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9c3ab8bd---muzirugirokopurizoratu.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab817bdf---kamopew.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fffcb7664b2091cc3e58c2db35479afa/68882379236.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078be662d1b1---33595867421.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f4f8829605d88777ba8e6a44223d045d/zewiruneveb.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca68ea555e---1007055449.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da625d49f5---43794019138.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2c3f28b3440e116b5bad52e3798f06a6/bofivav.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a31c4d165---34784883935.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014a0dfbbf---56600303703.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718f6ce2840---tawapuwitakalumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=charity+donation+thank+you+letter+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d7.bin
19a1ac5c02655985b38a412c020b73ed88177aa101523106e27640176ad2ef11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5092 bytes
font_01_sfnt_off0000f602.bin
888a1d548d2023bec132020ade97cffde07ab02801098a9167223b08a0c0cd4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10424 bytes