Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b5a897d0c2af51…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 13:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 14fd84dfd666aefa8b9c5460b96120b8 SHA-1: 14a77d5dc8003268520cb91d07c6433cf9a4f88d SHA-256: 76b5a897d0c2af5147cee9d63850eba59cb908a568f6095febbbb433691a627c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/43406b2fa636f33f6a390c9bde57ae92/fopojedaxomexek.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ec54100d043df68f3ba831323cb93f0/49069856884.pdfIn PDF document text
    • https://luminex.pl/upload/file/jogidovofamogavuretiz.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/76262785048.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/malarezifu.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/7871232472.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a97746dc4---4692783227.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/naboli.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/doloxisinexuve.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/newakefinu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf409a73c9---luzitomaja.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/45213337717.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fonidojazemufekugobupos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n8lppe4m7k83pgis378fmstop1/18683806640.pdfIn PDF document text
    • https://termofriz.rs//files/lamisax.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/60518122989.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b696e9bb12---81131046286.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2aa03le6ccdouuqbl97mpum525/10425948800.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rurumijes.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210605015127.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/998665719f14717b02506d077747e730/55711816951.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a7f0e083adfa37f84cf9196eb7463105/sufekigabotag.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/xukotepuwimapap.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/80050145312.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/56774767049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=another+word+for+traditionalPDF 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 17676 bytes
SHA-256: 135ef8318b4043c76b987e428a18de4aec65fafae2a5b9497ef51fad12ff3bed
font_01_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 10348 bytes
SHA-256: 0d95e7850d9b057e098dfe3060ec765e037b59bc41aaabe8c25bff4a22604776

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