Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe256c2ec17d4d68…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ebf4a1160f43fbb79da4b523160c603 SHA-1: 0a54bbc8e676d39c91a253b27dfef856569de4e4 SHA-256: fe256c2ec17d4d682518ef4d0d8194c5cad2f8c04efda2e5dba8eaccf1f138a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple domains, some of which appear to be compromised CMS uploads. The primary goal seems to be directing users to download files from these locations, potentially as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://karlsbach.de/userfiles/files/89720597784.pdf
    • http://veitali.com/upload/files/1533059756.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/77921554441.pdf
    • http://www.oomewatersport.nl/upload/files/mabegigivomiti.pdf
    • https://eclearusa.com/images/file/79770203481.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/80480412992.pdf
    • http://paroissedementon.fr/upload/files/widegekedaxagerox.pdf
    • http://zenobiacultura.it/userfiles/file///vixavofevajusuto.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de44116874---bosuwogudosukukulare.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/26375420338.pdf
    • https://dpengineers.info/admin/userfiles/file/wunoxosatanod.pdf
    • https://bbox.ru/images/shared/file/63930090798.pdf
    • https://tempegaring.com/contents/files/zazozedij.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161333e45878d1---64173313952.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130be1dd1add---siwasitabajorepajegigune.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/79f8e85dc754c9360204c74b91d0fc25/27637499803.pdf
    • http://loaamtran.com/files/usersfiles/files/roxafakonetijebuko.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/12686807477.pdf
    • http://consol.hu/images/uploadedimages/file/462570809.pdf
    • http://workontext.ru/media/file/39950186481.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/59276675298.pdf
    • http://chi-kara.net/Upload/files/mikudonukatamusuvijovedal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+20mb+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b773.bin
c223d50e79e455a505923110a3b965b7f3064546dd50fd3d59f629932445ecb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 15612 bytes
font_01_sfnt_off0000df30.bin
e23988495e0ca917184ba6a9bbd576a7b15fc0dd489a418e4b2460333e26c7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10824 bytes
font_02_sfnt_off0000f84a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes