Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc42108a8405d27…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 02:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4602d0a01bfa4259da4c581121028a83 SHA-1: 4b427093e7bb718490155b3fae0e105c4c44d6ae SHA-256: 2bc42108a8405d27e5c2b6927529cc574ca68830139d9b7a018884c618a3ced8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://scamps.biz/userfiles/file/ravuxuduwamesitugi.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ju9lkasckousu55j88jm3d1nta/lumavujuxogefefuzi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/47363808336.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f13e1f06e---parugufotafavad.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84742d3158---2012618424.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210614193626.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/89613914674.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5c9abab36b50bc32e8fe8f5dd7aa3b18/58436082671.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/82c1ac648376afa38a309b9d02688893/36187379632.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1d20b614b---76666434140.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sepapetawosaxafopoxaduwaj.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f7529ba195f32f83e6b35fdd5515132d/vokowizuze.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bkpjddofuo907arvtrc4ardq52/43697046652.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/lijerogonarulugali.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/sekimexadulibobularuga.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b850a0a9b7e464ce6a8d8bef7e95b51f/92577339963.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/rajojiku.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/xariguxenubax.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/22513523072.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fusagigexujakaputi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/jolasozovipizofiro.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vorinuriseluwozabuvetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=diode+electronic+symbolPDF 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_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 17224 bytes
SHA-256: bf3dd19be28bb25fccecd13a35b85a0a2b1b3edddd032103c0e930b8f46d8b73
font_02_sfnt_off00013da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA9 10624 bytes
SHA-256: 2ce4b0121fbbe7d4b6b779483838805bef775ef9efb7de47405aec0d5ded7f41

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