Malicious PDF — malware analysis report

Static analysis result for SHA-256 7797d8cf6f5c0800…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 21:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39cdea8b1f5c7b32da3967768a02b024 SHA-1: ca10e35856a18ed2efe6ff0ce393a303f30978ac SHA-256: 7797d8cf6f5c0800fea677d54d4f02c7fa9ea48fe0cdb7ced1e52cafd9bd53b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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 https://prawobrzeze.info/userfiles/file/xidejim.pdf In PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/mofil.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/78202924014.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/tuniribosoluvur.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rusefitave.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/futow.pdfIn PDF document text
    • http://land89.com/ckupload/files/85517593596.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c97d223aa---5497104938.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nuxugodejikijasatoju.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/30857866861.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43c8237d03---35265707443.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/470b183f31f186ee1fe3c87e0133ba06/zosurezilala.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075042c26c24---54571955963.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2aa71bc8---68707290115.pdfIn PDF document text
    • http://cl-pub.com/files/files/81316073840.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/21997619634.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9108d548---najedovexisukinolizur.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/36289395292.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/35b48f0df630db654b8799c6a5307e86/xazugofiron.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127361a8c1fd---fimadixewiwojuzadopodave.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/af894daecb1350f840a02e62c306ea48/13397800783.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4fd38a8e---11123786292.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cad24c8e9008d7311b83e0ae5d3b2b75/gevobeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=freestyle+libre+14+day+user+manual+pdfPDF 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_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 18780 bytes
SHA-256: f07d29677222b5e2fc1991741897009abfc715df6adce18bfa6826ef8965709d
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 11000 bytes
SHA-256: 9bade3fe1cfcd27b5d7feb9eaaa9b6ab96edf842c88dda29bc8b84d4264d76a9
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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