Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99d8b22eac282e2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 14:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 680260f19a8eb40c9d58f70ab8255afc SHA-1: f9575c5ec7909daea526777ea8e0792e3e6512ad SHA-256: d99d8b22eac282e2a987170fcfeccf7f4d2cdd6c4bf16055090a6b96dd5dda05
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://bsinteriordesigner.com/userfiles/files/68690440893.pdf In PDF document text
    • https://cailux.lu/userfiles/files/32026509044.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ece4dc6ade5---suziwegiwabatita.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/mivali.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/newerejimexidereburuliveb.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/fivaduketoni.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efec89ae541---24725810179.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/wefanidupali.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53966603216.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/06ea5baf98133ea001e79bb142702fcb/vevubetalobitisoso.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/demukeligazo.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/cl74o64i6ks4mlacjbqgeniun8/12983884370.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/82664470857.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/nunotipisesukelunifu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/c64eaee384e2e713429f4021f14cd83c/36546149043.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8245b10bf53a796ab7295d0568c4f7ba/64843831216.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/rawofixexamuzegovedidef.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa85b2f83---12181312142.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608719a753d30---dupewibadotapigogesuj.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/dezepiwotek.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210607014743-tefajanidezelijinivoja.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e97e00d508b14efce94fd34c06205a21/69161551539.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074108b93ed5---68646424863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=volumenes+respiratorios+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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10728 bytes
SHA-256: 2ab97aa7b89b19a5bf75578f2b7db851e0f6aafc4a12b0709c1f442f5579d69d
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 19812 bytes
SHA-256: 4a50c8fbf972a42d0dd132592c1fe5a1b56ef18d6816da2635842be6e46ddaf3

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