Malicious PDF — malware analysis report

Static analysis result for SHA-256 27955bdd6468f3b4…

MALICIOUS

PDF

105.4 KB Created: 2021-10-14 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d76e76ba974f66bd0452dd65714071c6 SHA-1: f3a75fd0f0381ce3f52395b0aab58c1303727e8c SHA-256: 27955bdd6468f3b490b0c2341401565d5f6bb892f28adb28009a3b75d8135289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead users to download further malicious content, likely through a JavaScript exploit or similar mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://wakabaeducation.com/userfiles/file/lofemunoxogawuko.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/gokenabijibugejemedeluvob.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/21947668122.pdfIn PDF document text
    • https://motoralbini.it/files/file/49524036164.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130758210910---83214850391.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/defaxekezilawolabevi.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/woveliruguwakukina.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/rifovifabobiji.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ba8355c1---nenimanafaxapepab.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e76f751bb42b7bc5cff689a979c24892/54480271288.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50983563665.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/lerivitasorabug.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/kasowemireritowako.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/42051921285.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fopalovudim.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/44756248715.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/70315136364.pdfIn PDF document text
    • https://triosms.com/userfiles/file/rojupam.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/72806197521.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/ruxakodazosus.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/50607456388.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/99502484768.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/komusekowizegob.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zokukonadu.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/luxeginawuledit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=wear+the+pastPDF 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_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 19536 bytes
SHA-256: 9372dd8f615999c4a330ffbcefd66c312e7dd00dc01e51afd62bde5b2701b2eb
font_01_sfnt_off0001695e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695E 9980 bytes
SHA-256: c72ec4be4b096ae15025029dcdf2b899c076250d811914204f2e052c459523ad
font_02_sfnt_off00017fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1