Malicious PDF — malware analysis report

Static analysis result for SHA-256 6782785552752ed4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 23:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cfb2f0c7efac2a1c2504eb74f87e75c SHA-1: 2d3cda8675fd942d0501eb37328e162552ac6141 SHA-256: 6782785552752ed498d858b76810de5966c3f61b605b459b2877f0aa47e150a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic findings point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=dhaka+university+admission+2019-20+pdf PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b013ff50999---wudetiruj.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zobuves.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jerapesukelizufuxososubam.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jutajogaxazawilixeselita.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccff4a4b18---tunawanawazema.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210820_23_17_9.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/88677385523.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/54ed520a82c57741648bd50199433737/rokefiloxukajaj.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/97292654184.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6611ba646---vosujame.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/72696937237.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e70c725cd5067706d5783e29e1a1e32b/69269642972.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/36718611469.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a081bfd26---mamukufi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/47030204703.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/26963669780.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/vezowibojesexuxegew.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b905f92fac---xudogefukibojowavur.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/27024655068.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/23395886189.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/2830905754.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881856f53---gexixukowiremupe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d4271a146---87944808939.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/38612417762.pdfIn PDF document text
    • 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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 20228 bytes
SHA-256: 916c8e28959f2915a487f69db39e4a738a26b48402849cfecb9a75c80bcfd6e8
font_02_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 11584 bytes
SHA-256: 943d902111354c6d067aad0d4daaef1613588a6fc1bcd1bc555bad141a6d6430

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