Malicious PDF — malware analysis report

Static analysis result for SHA-256 a451128775e45db9…

MALICIOUS

PDF

84.0 KB Created: 2021-07-17 03:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9384e9db99207208e403c00df5e64966 SHA-1: 8a029d7e53d84701c6bee88b1a2d88c191da5669 SHA-256: a451128775e45db9b7e182eb493bd23367182f7611aca56c460dd1d6ff6a8914
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's intended to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ctsgroups.asia/images/file/21570470735.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/9128131092.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d79f95c87---botatatatilujedomumobe.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160989c52cd2db---fotolajub.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/61660968357.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/30349266230.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/15363423909.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430042153213308.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ff27ef7a---92316904384.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2cbb69ae---kasefowemegaxetud.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863c7de38e0---61626451047.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///94845111924.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bfa9456580a03cd1bcd1213bcada7504/bowapokij.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q5b7vlkenaljn8a7j9oscuk1v5/rotamanobekuxosolapu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/36625222973.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/26124377704.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/56864269968.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/65090903229.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zakiziwex.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/76273623730.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf478edefb8---mopuwurelewobalajurixag.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1496b2d6---60448896002.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/tesozarazidalaxa.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/m51kn97r7con582o58pht9bshp/7739035936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tuberculosis+is+caused+by+which+of+the+following+bacteriaPDF 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 11156 bytes
SHA-256: 10db99d45d1ff966923e2f50d5f694a0f9931659defb22d349cd527f820774f2
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 16472 bytes
SHA-256: 336f60d79d8775b25cb2ac334cfdb74bcf8885a44a64b8363873d3b7b287d213

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