Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cf6e8d7a9ed22a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 08:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 139b3d6f059fe4f80f3fd2bfd57cd377 SHA-1: e843f71712ce74c4b317e1d0c62cc33e964de8a1 SHA-256: f7cf6e8d7a9ed22a63331603ec97f317e88c7d23a32482bfa242588b6d18af85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external URLs, several of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+use+meshing+in+solidworks+flow+simulation+-+part+1 PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/srq797o9045re82g0ttire11hk/datiwi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8da0be023c81bb26793879577137d7fa/zululanidegafi.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ba7a1ab90949c0009fa0da7045848902/gibapiwakubuwi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/wuwuxidiwewamegepupasudup.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4d3c3de7585a9d1c47fbe91b969f794d/furuxukarig.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/wisojutu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/17927625492.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/62931733019.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/mesonugarukerewamelus.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/571a86d3482d5b55c4f29147402a62e4/23117086328.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/62557021644.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/17761054969.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094778f39b---kikaluvafutedanosurepev.pdfIn PDF document text
    • http://klpa.net/userData/board/file/749497248.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/61e0d1e12866f843993ffca396980c09/11208100457.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/fegekatafamapekulez.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/lobaxopeforabovupera.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/56649846549.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83c484e9da265c6ff7dec93ef2161b13/todopotekokan.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/dosof.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e2a64526---feravobomanogofakorozalad.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/35129392189.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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16688 bytes
SHA-256: c911576de45b211d2969934ecd02f6cef2ebdacf33c09503699854eacb4fe2ed
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 11300 bytes
SHA-256: 52d28a518daf348a4dec3597ccab7f4ec3ffb6fc5a826d64faa4ab331ec6dd04

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