Malicious PDF — malware analysis report

Static analysis result for SHA-256 998de67cff54f546…

MALICIOUS

PDF

87.9 KB Created: 2021-08-11 22:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eae651bf93be4d637503990a357276c1 SHA-1: 00092a158f51b89e35f5c5113bab92695751ae6c SHA-256: 998de67cff54f546c943ee8ff0d21f54ec551282efbd0071f1f9bb1f789b2c54
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download other malicious PDF files from compromised websites. The presence of multiple links to potentially compromised CMS upload storage and the use of UTM parameters suggest an attempt to obscure the malicious nature and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aead0cd093---jageterapegizadenosu.pdf In PDF document text
    • http://cocoal.com/uploads/file/tejolowewowupawupudivi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/92c2f8f3d677da346b77fa495607b924/bilotosedusejozexilij.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/87d7804a83969bcd5a880ae8069cb32b/17493061276.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/29914516878.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d8df272a0---73544472435.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2oulc20ne74or3k6vjieu4v731/genuxadapawixigu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/tuzadaxujexoforasatefawo.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/71420213862.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55805ae8a6---66179454522.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f614ff1f---48399831538.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/48836963740.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/db8e08744734302e1dd2ec6250601b06/vaxokelujanosipawuribapos.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/76314065991.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3067ec63---55466643893.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/difakunufivafata.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d066204975---54653252718.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/86ee91ea279b67043529630f1db3f932/81779950281.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///jawikofurafudu.pdfIn PDF document text
    • http://sushibelovo.ru/files/66325706766.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/getopukogiz.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/93474095537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=qr+code+reader+free+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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 17396 bytes
SHA-256: dc411ee059e29523790f42b7b29a19c2f0f3ecac9cfacd238f0a75a93cc803a0
font_01_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 10256 bytes
SHA-256: 8dac0b0074456fa1fae4888d8aa5a6da4635db75550668ee89f57cffa356a673

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