Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94fe5e20d6dcb32…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 03:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f455b36b1cbccf0545aea409180a1645 SHA-1: 17ee218e22d94de53e5a6d1f101884719913a73c SHA-256: b94fe5e20d6dcb3266cf1c323e846b14b263abcec7231d3ad7e9447dd4ab6a2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=the+price+elasticity+of+a+monopolistically+competitive+firm%27s+demand+curve+varies
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076328bc594d---27700399531.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9e13450915dae3a3f1138efda0f7545a/tuwopum.pdf
    • https://sport-jicin.cz/dokumenty/bogif.pdf
    • http://popnmusic.fr/userfiles/file/25408402778.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f44975b04---jubemusaxigavadiwen.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096902f446cd---vutadiniritaxenebimupu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780e501de63---kukafivetewugawegu.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/hsai7nafvo3q6ae8fmv146sjv5/94766391063.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/6imob1s0rc57n2g73ap47tci59/senominobupiwote.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/butikapeweb.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d7fkio8685vbas1vahourgbc3o/87607462635.pdf
    • https://baptistfriends.org/media/sigamixal.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr9t1715fh9e3e5ukunkpnofph/50130636236.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/92442894595.pdf
    • https://aartipalette.com/userfiles/file/rijebodopuxudem.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/96783af4b13ae8ea8843c4fd09ae5fb9/dakaxisavaja.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/35aacaf24f2b98894e9b011bbe76df7a/86343223634.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/okstl4qas9md6svd1meh7lj1ro/24206387751.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086833b5c73c---bepexofevopetovajase.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/fokamonerebotivaramosiv.pdf
    • http://supermarketdv.ru/files/file/xerokukadilagesemokisu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768bc351a2---15982436036.pdf
    • http://korytnica.net/data/files/nexojifelug.pdf
    • 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_off0000f6c5.bin
290e52eeeacbab7864694a80e8ffd8fb0ea33e462ebd5abd1482b940d0bd8c42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 17696 bytes
font_01_sfnt_off000124b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16792 bytes
font_02_sfnt_off00013ccb.bin
e02958463c89fd11974511317fcd057d14709164e4e0968bab6cf5bdf08bcf93
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCB 11164 bytes