Malicious PDF — malware analysis report

Static analysis result for SHA-256 b935c3e55cddcbff…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 14:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae67651004fd909e49b32b9cade5c063 SHA-1: 57af266c5da5261911eb6200df583b16a8bfb222 SHA-256: b935c3e55cddcbffd9a80a18adde4f85c051c03f34fb81747dcf288a42e92478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=grell+sutcliff+episodes PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/06737e649c0f92128d5e7a5f655e9c20/bijejeviwonajixonomopa.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/87899343244.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/4544146647.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/65294041205.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/dafedosigi.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/51516386839.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210924_3EA1B7A3C9C26410.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a553b6218---sokifugitonoboku.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/34227588922.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/31997905338.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/43792026999.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/18519921642.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/4056413032.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/rurugipi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2ee53176af750aeb849b735b5a610c3a/46229996955.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jumezigurojefapiju.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/50225904485.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/wimisuwajewunuxusunufup.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/14846264623.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed5b055180---kefixeniz.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jelelokat.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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16176 bytes
SHA-256: b16ff19fd6f9ea99a26b39736a649ea8241033c805b2405610f2d256a9786d2d
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 10484 bytes
SHA-256: 1c338a7c46aa75dbd133c5cdfc50b97edffbad2838a2abe0e99a74d00f0d8df0
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1