Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc46b841b8029e8…

MALICIOUS

PDF

75.6 KB Created: 2021-10-01 01:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae586fb0302a6ae7cc3044a53bf45884 SHA-1: c94c2b6818bc6e9028555b5caa766763ebe2ebf8 SHA-256: 3bc46b841b8029e8b26c4180cdc114d40fe9c9b429b09aacf6620a37bf860f17
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm points towards an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://hometeamcorp.com/images/usr/kemutumediwawapo.pdf In PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/35757609378.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/48a42c26c77bb5ca5b0c4686205b8275/jonowi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb4570ed7---majema.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/57591502856.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/35264175272.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/refejinovoleviv.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139087bc1f34---notalepubafudep.pdfIn PDF document text
    • https://satesayap.com/contents/files/17077274430.pdfIn PDF document text
    • https://best-label.com/upload/files/wizip.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zipol.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614680ca4b0e8---9758529537.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/powaxokivogeme.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51255792700.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/fikewiketoketizogugejetap.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/kasesuwomex.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/15608476123.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161456b6e8bf3f---55550992733.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/22b245gkd3f8akn354166r06f2/rilezenajijerixosax.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff0002e8c---xavitixatebebefugone.pdfIn PDF document text
    • http://identik.hu/editor_up/76531621804.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/molijotilafeluzino.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/61587676471.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142629bea1a3---36932970300.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d142069ac5---94074681447.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/80770951754.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/53665952578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=klondike+solitaire+apkPDF 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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 20300 bytes
SHA-256: ece60deedca59a0463c7c51690448a5be504dcc4210b14e4b4800b32f46447c0
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 10468 bytes
SHA-256: c9425e1af132f4321dc621a9d7519bf7802ec5997c805e945038694b114c99cc