Malicious PDF — malware analysis report

Static analysis result for SHA-256 17887523d32f9f9c…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fb80ee8cc7aff50e3bbe6f0bb96aaf4a SHA-1: cbd389e8d2efd3a25c13392fd4e851f1eefa21d7 SHA-256: 17887523d32f9f9c8e78e95efc2f8e56639d842e3e088d68a6bacb0b4ef54990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/812684cd3f1cf1c0594810c9e7517830/49067140781.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/turukod.pdfIn PDF document text
    • https://advik.net/userfiles/file/ximeropokizako.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d827d2219b7---kawikutosidijof.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/jamujarijulomisawa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac95a1833---lutune.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/lazavomexedotakogixow.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/58885276904.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/34976675545.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/587668603cef898e7658ceb27a043a55/12195290661.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210622161352.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/dd919075f52db32094081d9f256602d1/xazebaguwebiwefonat.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/jedegipudakurorilivakoku.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f6b1137---49086410134.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4b5e71bd---57501234285.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/56780516109.pdfIn PDF document text
    • http://reichspfarrer.sk/file/89667067389.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/43180962507.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446ca6f33---godukutemurape.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/polevepatep.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/fagejinakevi.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/kumununi.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/zarogunolexozuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=super+smash+bros+melee+n64+rom+hackPDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 11100 bytes
SHA-256: d33472f45b84e49c487d861a2bb0a9b0346e9aecc5b7086aafc2b1cb8633b91f
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 16652 bytes
SHA-256: f47463b357419135e7ceea12a8c71a6339d67efe035a6aaca2d2e66138c54146
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1