Malicious PDF — malware analysis report

Static analysis result for SHA-256 4583e3b04f7d0af1…

MALICIOUS

PDF

96.7 KB Created: 2021-07-08 09:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12cfa92037bad1807f3bd94718850b4a SHA-1: 9eadc29eaea00c653227c95616771e656e928be7 SHA-256: 4583e3b04f7d0af1b7230d48bad21ad2c7f104d05fb1d132109001f71e7291a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress upload sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5097e17f6e---23088701015.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22a3dfad24c9c3f786189b4054f015dc/69404040223.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080082039dfa---82051730105.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd42b2b74---65460287626.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/bf43816e36a775acea62ff0312d30548/23764407041.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/160c04a28f9fe438c3ce0263edafa1ea/zigidupovuwudevu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104aadf555---88437927246.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/xopedepeledibemexuzavove.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/93769376424.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c6b2ee640bc668eb6af553671859547e/37003609192.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/58060652437.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901ed66936a---ruxijegerivo.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/lejidenujudipurowi.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021571122366808.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8b20ad600efa6974ef023cf2a8508d12/18673483834.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/eim3qd8iiul44g1k4oopd2dr83/liketaxa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/feae18c4c02964049af1aa317df3d69a/nuwefosobino.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c1be3e7a---labivabagaj.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zesizisuzolemojukamik.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/kafetufifeze.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/d5a65lr6lqnv8ab3rr6kcpp2jv/fanezevul.pdfIn PDF document text
    • http://omg.su/upload/File/duxet.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9bfdcc8b---20721729754.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2e29de2ee2d6bf39749d419c2267647f/tipameze.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/13f0608bc9b5adabac63f4a59410f954/kaxapexakadonokuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=white+flower+quotesPDF 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_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 10368 bytes
SHA-256: fe751f40e842b00577d53efbea16ff6634caee0a177c976e7d2da16006982550
font_01_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 17056 bytes
SHA-256: 5a25e78022fe36be0f0839f08bbcc130fcd72b0e2ff7025a89c14e37a41b029a
font_02_sfnt_off00015d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1