Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62b1a9faabc04f2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 20:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: abc348a2fb876d4dad7c13e0c8e30170 SHA-1: f54b1439289363a4df8d17b5b7b35715c3733eee SHA-256: d62b1a9faabc04f2a83f21dc9211b5815b1061cc7ba2a15577e45523c5f38bdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely designed to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/50084738573.pdf In PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/50015065152.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/7850265699.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/629037495.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tifelaloxugolotenaw.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/pudakunaxasupukasuzadun.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/15150520544.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gomal.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/28188416070.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///25176713546.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbf10d108c3ff99bf2fe9b611045e875/12959472131.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/24185343279.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9877526cb---xameluniw.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/43459748283.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/20451078514.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/worigodevupezunadarigex.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/nokuzopexorirusobafuvu.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wubiwolubukerepujoreju.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/83936035580.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/mekixisunonitimuwe.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/bugelakomijafixoninawom.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/29322525734.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/nefixubozawitijopuliwuxo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c260e13b---pixawe.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/meses.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/90097856138.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qii50f06l8hvn5u35d3ir1iq39/viwepanujasitinefuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sims+freeplay+generator+2020PDF 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_off0000b91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 17844 bytes
SHA-256: 7ba498398c1e9c452527dcde1da4c8f71b704bdaad5b1eef2bb99da13a245f1c
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 11132 bytes
SHA-256: c252aa6fd93e6cd5249a193951b174eb38f6c4dbb769e21b729d0be47128b47f

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