Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8f9a788bff6084…

MALICIOUS

PDF

69.7 KB Created: 2021-09-15 11:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f5520fc7f0a9a8153da4b427cd313c7 SHA-1: b514d876f64d09b6d30dd10933cd883341c48141 SHA-256: ba8f9a788bff60845e2a6e9d02449d0aab72b45bc576c2823f7fd58d0b65f33c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mamo-tato.ro/userfiles/file/31489349180.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/35914298715.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/19180756535.pdfIn PDF document text
    • http://techmechengineers.com/uploads/56768859653.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/81931487940.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/tugejugedasudu.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/49294483380.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/69450772794.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/gasolulabalivemixivik.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/68036271205.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/sujiwusazopi.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/nesukot.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lemozuso.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wopenunisikoz.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/zufowasabe.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/wapex.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a5e28262818dfa2de98ff277925376ad/47624644156.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/21018325558.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/rolepagowepap.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/zoxibudojetowez.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/69506121323.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410de65f969---kulukusazud.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/timin.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bclf7n788fhhogcalkpfq8ptdr/nawoj.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/88610155910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=death+run+fortnite+2021PDF 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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 15404 bytes
SHA-256: 37534a2ecb554e829188c85c243951d59c5189ab93af0471d676054f8dff56fb
font_02_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10492 bytes
SHA-256: d8225a4d3240a75a4c091f8f50cfca18d4b8187a3cd728d627a666ce80be5440