Malicious PDF — malware analysis report

Static analysis result for SHA-256 79671b0a8a0627b0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 23:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fc115ab12d012ac7062b646e3362234 SHA-1: 0bd9b065a6da42b19291273b847f9148dfafecf7 SHA-256: 79671b0a8a0627b0fb3bf269fb881ba63edb044221369290e4fb3cc45bd31db3
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including WordPress upload storage. The embedded document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://geniuschulatutor.com/userfiles/files/71853761652.pdf In PDF document text
    • http://artside.org/data/temp/file/bivurasubulimabali.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/3332679717.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/56gipbil4324al9fgfosgp3jhp/41162463416.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/50686795208.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9611df5d---watigujidupajepubo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/sikomojosawidebujo.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/vugimagoropaxozowasi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a236618f3b---18630283652.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bacaad020d7a57a0450b0a6889e95112/52835586818.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/531b7c811b5d36a8b89708852b09d04c/25188023473.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/62435150019.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcde17d6f---94346089368.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/wezekiwefopetuvu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lodezaditubepuxaj.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/wopof.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/22748972350.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/87349800433.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1e4807a02ff14574c57490efb4678554/kuwijonalizerajekag.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32a4c6edf1---mudunumalakakezom.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/12989306343.pdfIn PDF document text
    • https://datajournonepal.org/files/99307143838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fl+scoresheet+manualPDF 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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 17760 bytes
SHA-256: 6fc8666602a037ea872604ad45e69847f8c3a35d3bc09276b4822206d4410e36
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 10480 bytes
SHA-256: fd5644d9ed4c3468c8379e20cfa0ebb03f7e300f6c7a590a67f595350ff57889

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