Malicious PDF — malware analysis report

Static analysis result for SHA-256 9985a1d815519290…

MALICIOUS

PDF

90.0 KB Created: 2021-08-10 19:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55c1b6b9c7db30fb39b2f326d5c5a66b SHA-1: 90291a1852776899c0b82bdf7c20616cdae07667 SHA-256: 9985a1d815519290b3ee87299796f6f33bb03e2e9752d3afd994b26ba5b6ce17
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 a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The presence of external URIs and link farms suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=new+malayalam+movies+download+app+2019 PDF link annotation
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1lb645l01taer7e9ssqeqmmpv0/jexatefun.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/41321376a6b70a5c15d31d9d2d3fb700/21123207598.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/32881903654.pdfIn PDF document text
    • http://chieucoingason.vn/files/firudome.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a4329761f9eb478ea224c456ce72d281/46747712567.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cb9f068d---52487505854.pdfIn PDF document text
    • https://pmms-online.com/assets/file/wajapuxomuwuzepif.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tasag.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210621_031412.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/74436359394.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210623063430_tvdbx9.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e88cab18964bbf1991d92e5c2e49059c/9337608204.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/pigonib.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/111ecdc2342372d3abcc549e5aa946bb/29463906623.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/00e0ee2b689e014c1e06c089a06210a0/linigumobel.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/subizibepiwoluvawupu.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/megasugafasamenisinepixa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160988e5469d65---loxitopurefuvegamibabeku.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a39d2eeac---larupimifobimine.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_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 19456 bytes
SHA-256: 068e97003bfa26d21f4d136c87e273e1bf1e661d42b628fb7af84c2c0338786b
font_01_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 11060 bytes
SHA-256: 6358beb53bcc75f971055d344ab3b544c465cb9a33e54e56ad9e13d514378d33

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