Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba278f45eed329f…

MALICIOUS

PDF

99.2 KB Created: 2021-08-18 00:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9aceb2cdf14e28fa8ed75f050041869 SHA-1: 28d89167431665d5f35930cdac8731d613fe3eb6 SHA-256: 8ba278f45eed329fbbc84bacb3fe202eb90dcf1c7b93de67d942ae59e3f423d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=letter+of+undertaking+and+indemnity+sample PDF link annotation
    • http://rld-carbon.ru/file/60222366969.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/nm9p06emm0gag2t1d87vag140t/80014067129.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8df4d4277809743a4485a538712cd833/roviwatusabuperad.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2b0a3384---duxuzumilotunawejin.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/55514520145.pdfIn PDF document text
    • http://pasted-radio.de/web/files/96918350382.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/zajolijeb.pdfIn PDF document text
    • https://red-adlay.com/upload/files/wikivenez.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mejonub.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/68ids71un6vnrru5uafcsbv3s5/firawukotadanesi.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/70532718949.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160854e834143d---xujoxubifinizowerinewitu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b8aeb98e7f4a89fe87f578157874f9d6/35391625478.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gg34qsspdpjsko816vaitj2ip8/wesokusimexorojuduguju.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fu1vi31o8v4lao2eqocsrlj27r/bisugijilaseran.pdfIn PDF document text
    • https://rajakedua.com/contents//files/47402226398.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/03394d932df234450d9e00b75320bc6a/zukujemu.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/bujukejefetoziwufi.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/54821469418.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/zujexiwebuzi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4709c6a7---bavuraladafifolul.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/zozulakilepugoladovusab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a581c93550f769b838f3f3091672c32c/81808975918.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 3280 bytes
SHA-256: 80489ed5e858b82ba5d607e20b314451efed8eaf981c61b9b5d41ada07d23105
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 19568 bytes
SHA-256: a5efb1ebe161d02dbe64a2124484a42caddafe84f83c18eee18c066dccd8f144
font_02_sfnt_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000163a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A3 11104 bytes
SHA-256: dcfb1437974f66b76794c2be5d082d9f3784dd74a569803d81a5a671d9a5abf8

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