Malicious PDF — malware analysis report

Static analysis result for SHA-256 546fb25040ef7482…

MALICIOUS

PDF

86.4 KB Created: 2021-07-08 04:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a72aa3ff6dc78b490a6a6e37e12e4e2 SHA-1: f642a880d60f412907bf0bbfbbb0eae248f0548a SHA-256: 546fb25040ef7482c75e383becccf6d24e1c8244b222825d66c749582bb144be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://guides2alpes.fr/uploads/file/bezuluzoxerojemafonezatit.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/03p14ctuothr5o4ecglpv3vrs2/fivixopelusizajulekaxulan.pdf
    • http://hncastlecable.com/d/files/raselisupusuzejokanila.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae07b61b1e---67079182354.pdf
    • https://aksusu.com/upload/files/82263880434.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e944eded4---pibugofakutoraxavol.pdf
    • http://huile-de-nigelle.info/userfiles/file/31112290138.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/rfj338lgbd9e22blufrve2huls/gudifenudut.pdf
    • https://an-professional.ru/img/files/file/lenevawuwopamaper.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tisg69gd10vt1q264vltfq5572/59187157615.pdf
    • http://axwelindia.com/uploads/zefesazem.pdf
    • https://pcstaiwan.com/ckfinder/userfiles/files/kokoxotelegavut.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/fuduwozobulamobim.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/xomuzenuzufonelulonap.pdf
    • http://toyotaquangninh.org/data/dulieu/files/rofelazeku.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2edec10d1---veduzizevafokujelisebi.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/029d1318f2442588bf44179a85f4d0e0/kaxafikonutex.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/fhaukjdr2r7tt9piek0n8gmjeq/98922822375.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d8095c1---60233349533.pdf
    • http://gabortech.com/admin/file/rimusudefebasewugiba.pdf
    • http://hitecds.com/userfiles/file/10729349694.pdf
    • http://angarakshaksecurity.com/userfiles/file/visubabekuzera.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8dc4d869---91937633345.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/xurazorumibogobadolaxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=1000+kb+equals+how+many+mb
    • 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_off0000e9b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 16792 bytes
font_01_sfnt_off000101cb.bin
b3e7ad41ffaf2247c2b2135358fe40ff6047ba71f1452def9574fb850a243ba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 10840 bytes
font_02_sfnt_off00011aba.bin
b9a4480528cf406ff91a64ece8077fe718532c7880e6816587418701de474a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 18188 bytes