Malicious PDF — malware analysis report

Static analysis result for SHA-256 1501b6ffac2d885c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 12:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 610c5411b78d3f647b969d804e6ce2d3 SHA-1: 43a3a0cd62c1171759826f071a0cfbcdc2868c70 SHA-256: 1501b6ffac2d885c9b7f9210931ca1f3b973661980c8f931809cca3212cb4cf0
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and a specific ClickFix social engineering detection. The heuristics indicate it functions as a link farm and potentially hosts malicious content. The ClickFix heuristic specifically suggests the document attempts to trick the user into running a command, a common tactic for downloading and executing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57834323095.pdf In PDF document text
    • https://sporyolu.com/resimler/files/toritedanabaw.pdfIn PDF document text
    • http://ndt-ultratech.com/files/21241474759.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/14974692643.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wefovexevog.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/bededera.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/01/76694458307.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/64519704875.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/14271565899.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/30505556312.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131893bf1a79---62077565123.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f940e17ebf36ff74a52c2310ba8af6ff/sogaxawifebiwudu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/39884709911.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/trsvmda1g3src64qkm2fe07mo5/makirutaxebuduzuvetil.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/98805986603.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/13146684537.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210902100811.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/93476617287.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/97054971254.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/tijojev.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/44185231659.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zaguxe.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/konami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=get+flutter+sdk+pathPDF 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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 18696 bytes
SHA-256: 2a06c5c3875e04e4ec629902ec55a8c9ff0ca8fa2f7fc7ce3f2aa0a4bb5c17ac
font_01_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 10508 bytes
SHA-256: 7c5c284aca3d66130300ccd2afdfdc47e77a26d9c4c35c740e2bbba86ed16e75
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.