Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd270d86e1865552…

MALICIOUS

PDF

79.7 KB Created: 2021-07-31 12:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 880d868e9fedab68fbc3c42fd943e2b1 SHA-1: 19b6556e68a496c11d8d6aada052177668fa3cc0 SHA-256: bd270d86e1865552c0a8a92872e591afd41d572f79b025fa6893d0620a293f1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mahnomenalumni.com/clients/879209/File/97677237944.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4052af49f0d37f27670ee95d1455e795/96696922851.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/3144119362.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/895945fa906e2c073d4e3b510e763e9b/86639979443.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/52678943905.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fb492760cd5679f8c62a3dbd44d06bc8/misojem.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hbrvgskm9mf1m9ge7vcraj5m75/87710235550.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/33274978355.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210718190204_i03wfa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc336e80aa---64582445976.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2e5b80adb6171538d771fd0d9ca6c0a0/xirimibajefunizijarefa.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_171812.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/kevawobi.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/27790754828.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b947eee2---buzuwagudavadakuxi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80848655918.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ac3f005f1a217f04facb4d2e019eb7c4/motebofotuzeraboten.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/bawizum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6b185a15---22091027992.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/76860272605.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607040453b50c---89663895940.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/vuzaluwenanojabawek.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/60961700848.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609432ec62b2f---bugefarepojidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+cheat+in+slither.io+ipadPDF 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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 17804 bytes
SHA-256: 41010d05b99a3698a490d6d2a404965aaa69f5f72811149abb388465d622861b
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10756 bytes
SHA-256: a627da0205baa8beb58aa3855b626cbfea2553f262cb1f523718960f167d9912
font_02_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1