Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da35d4fe0bd29fb…

MALICIOUS

PDF

150.6 KB Created: 2021-07-21 01:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3a393f02db0fe95b5929e2ed848590df SHA-1: 8c753e7ad248e24b7ab920e4fdb1d69b3d7a5297 SHA-256: 9da35d4fe0bd29fb8433e143c0cf9a96efdc0345182314140ab2e04b216fe8b1
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a download button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a808c68e187---84397901361.pdf In PDF document text
    • https://secolink.sk/userfiles/file/86557150696.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/48314475177.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zixivotudojisanixo.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pegan.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u1i0n63i579ksngsh65so02am4/86371071557.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/tuwowi.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/48337511983.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82cfd58123---tewonevuropefiluke.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/88642476898.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d157n2b5ghc44lm6i9saoe7is0/67360604703.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca0f27720---59514354209.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf0ce107b.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba448f66a---fafewalawewuwajujezovik.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/jifiko.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/098cb995c22855ec3e1bbbdc68df3b57/51173990020.pdfIn PDF document text
    • http://asustainable.com/global/file/fowowavovijepunudo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c68b58563---40056366376.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/48035266208.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xofoli.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/34338148138.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/26l6dkm5pi0v6pov6vhq49k4a3/90940285882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chapter+17+european+renaissance+and+reformation+worksheet+answer+keyPDF 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_off0001e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20112 11364 bytes
SHA-256: b2ad60808b933591edf3d666bb3fc58547d4bbc6fb71b0e37e133908bd00ab1c
font_02_sfnt_off00021be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BE1 18276 bytes
SHA-256: 2fc5e47c85dac9ad9379684115fa52d92c4de115457152b06e97e98d404fb199

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