Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ef3ac78fdeb63b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 20:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13876b2b8e733cbe729c349d6daeba3b SHA-1: e517a5be92c51acf37831c66361a25ffa0eda789 SHA-256: 73ef3ac78fdeb63b3d48be32e63174a13b4cf9c6519684df0c272db516a497ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering, instructing the user to press Win+R or paste a command, which is a common tactic to bypass macro restrictions and execute arbitrary commands. The embedded URLs suggest a link farm hosted on compromised or disposable domains, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.hgbehringer.de/img/files/files/degagexodadalasesaj.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/90186213596.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/agopag8bltvgo0ssiaqkv8pbr0/30169610796.pdfIn PDF document text
    • http://firegallery.ru/img/upload/53238236179.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeeab991d4---53169122198.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/73307023604.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/basivaf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6b0098f5eee8975c95ccf0bcda669dc5/vudewexagoki.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210603173257.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/75724099103.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4803541b9---xawopimaxigo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/db7d083d6868bdd24fe75f87771ffa7c/37537835541.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/91574f2c9205768a520928bbeaad883c/pizijalowevadafigumuni.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e7c4e402---69526901200.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wawep.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075a23a2b8c4---pusedewitizefofegon.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3044a5bcc---9127783374.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c9cb9eefc52652638bf85c2a0e42349c/82774874430.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598a3e1c87---vexufapepalutajipafisur.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210607194217_403mhe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bsod+attempted+execute+of+noexecute+memoryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 11012 bytes
SHA-256: 7313f24406640076f15b2c51239cde2c603cffd8a6806e4955673ec79b05a47a
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 17860 bytes
SHA-256: 5d221668d8d371eb013e50e1b3665715043b57198ff456addcf4880a626a9ea5
font_02_sfnt_off0001366f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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