Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9de18deeeba7cf…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 04:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 508cc193da69d08bbc3f7f3c91ef903e SHA-1: c6b86b85e949ca20190632c6d6c9921e63dab5a1 SHA-256: bb9de18deeeba7cf81c5f8a55f050f35ff25da30793add145adf540e569e0dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The primary attack pattern involves directing users to these malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=henry+the+second+and+thomas+becket PDF link annotation
    • http://www.alex-vasilkov.ru/images/wisdom/file/68014732850.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/nabizimakadabaxipaz.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/61055111402.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/91389430330.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078f9eda8c19---13058172069.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/637793e8dbd2e671fb8e9e4468b68f34/14244358608.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jofaruguwoxibaxemavejewu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098953358956---22162422685.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3006031be6---9966172611.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/45682236527.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cd876618b3d4476df2acae999921e071/9977741708.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/38065661071.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd094d1225---lisaved.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/11784482881.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/21ed39460ce41c7854b383f6434cae52/ketisujavuvo.pdfIn PDF document text
    • 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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16696 bytes
SHA-256: a8b3dc8f9672ac66036c28bc7e8016bb899cc60d2f9484801869b9ebcd624eac
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 10832 bytes
SHA-256: 98b82925d31bcbab088fa199ca3124a1e23efb1b88a734c5e50a78e75ac79578

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