Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1c20a671ae4380…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7ae2b34815aa1b0b7d5fd1ec425b5dc SHA-1: 205d657a462ea95d470e6625ba0d38ece93c5b11 SHA-256: 9c1c20a671ae4380210be2559fe01756959b13ed7d8801a82ccca7503524ac4d
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chieusangducphat.com/uploads/userfiles/file/46232322296.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa589ad13---821028432.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/83747652037.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/fejonavadoxobawisavonub.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/58709349605.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/19426138431.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060205418389.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/96757771622.pdfIn PDF document text
    • http://school15-tyumen.ru/f/58724962484.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/69294524719.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9c1b8218---54258826222.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/26535989577.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/63118165066.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/zobeporogidavut.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/77938665370.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kedovexizajixelok.pdfIn PDF document text
    • https://amgaa.org/temp/files/koxujidogaroduralip.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/4379575635.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vivinu.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/gajisobetaxa.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/xipigeti.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/39674865432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lulu+box+apkPDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17176 bytes
SHA-256: 79f82a1591785f0fbcf9030bdbed846bd6b21b56e8cf70d597b88162447968e5
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 9940 bytes
SHA-256: f0a88bb7e65e589f0c579f6ca490438cc6b46c2e0d6396c3c4814ca36350d448

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