Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f33ce748029fe1…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 20:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3949730da64566df547b28a884343be9 SHA-1: 269da9b5360e4a10a094c249c07aa782c342a824 SHA-256: 36f33ce748029fe150214ef6b5d0c4a48fcae25c1b36f578172c0090630115c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm suggests it's designed to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ag4qr8h3b1j4s3lpasl8cuc8fk/nitiwaxatuteduvadagezij.pdf
    • http://adaviestransportltd.com/userfiles/file/bexobolivedaner.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160706a0594f7b---59277783656.pdf
    • http://bukhatirhomes.com/userfiles/file/wijobobugugu.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/15786665413.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17t4tp88vofk7pailmggq1h71i/643501324.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c4f52dilhpn32po8kduvtmn697/8794628616.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/858gi6nvn74vbb3r5b2p6en06a/53303982129.pdf
    • http://bawaconstructions.com/editorData/file/ravadusofexetazideladexo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62fe54845---xexoke.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/gedeka.pdf
    • http://zjqzzx.com/uploadfile/file/2021052700025673499.pdf
    • http://absolutelyneon.com/userfiles/file/46867751334.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e7d0332a4ed8472a63d33f7ef17b05cd/nivitojipuwuwofiwufigaz.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/jotinalixakijixijipejo.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9f27cf2805c212836fd3fb672e04eb27/puromikodi.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/506d95d33706e686352ff0d4650d65ea/guletujevodimadogumasevaj.pdf
    • https://walkandsmile.com/userfiles/file/kuzifejavabunabiletu.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/1499ae4a6c863790795f52ea9319b7f0/26598980507.pdf
    • https://baoholaodong24.com/userfiles/file/18969066407.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266862aa40---dojikufuvare.pdf
    • http://jjmcp.jp/userfiles/Image/file/28078495303.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8d5918e59b82cdbbe992da64080434c6/kuxotazebuvajaz.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50594942b8---pomuf.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a36fb3c369a2004557732abfb85b62f0/40860680573.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fecba04b9---dinifagolegalogusas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=prefixes+and+suffixes+exercises+with+answers
    • 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_off0000e658.bin
a89ef80b4a9e700e701a2fb0ee22b861bc6eb20f6e146ae1e24cbd4f3eaf9076
pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10696 bytes
font_01_sfnt_off0000fee6.bin
810e484d18fa6d10d19ff58955c09ade97e3a6e988bdd3af8c7bff208da034c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 17088 bytes
font_02_sfnt_off00012b5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 16792 bytes