Malicious PDF — malware analysis report

Static analysis result for SHA-256 735abbda7835e6c9…

MALICIOUS

PDF

80.9 KB Created: 2021-06-14 21:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 031913e97e89e0499512c751d0f5d5fb SHA-1: 8214e74f53418e0126d2ae68d0f3706602a61d1f SHA-256: 735abbda7835e6c96c29100fd8252c4e6c6c4de75c9165b6bea5a509fe2165c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=tafseer+ibn+kaseer+bangla PDF link annotation
    • http://krzysztofmalec.pl/gfx/fck/file/gotanazutinotulosulepivob.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/tasamanazobi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a803e79cf20bc4dc1d3964e8585cbad5/6309342607.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/mozigir.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7m3r23c966pq02h0md1ivml14i/46752776326.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/14700015654.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1915e6c3---48013401972.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/66ee9e4d66c15197c34840694a7afb95/mixenidofofusamijuxow.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/2915156100.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/09d85e35ce35c560ded463f39426a8a3/tilijupisukinebo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5bc1185f44fc55ef9bd4adb220f2c70/logawazusolaju.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/738bdae8a8cb14b1f00f2325aee2af60/77894583997.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cc9cbd7---91646676822.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc8cb78bf---7878271558.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9bb614431d6a7ad8435f773fba68a170/97861475311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea500427f---mopawonuk.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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 4688 bytes
SHA-256: c62c4938725230db806b8d8685b009dcec02fe47765b83b09f4a30ad49bdf45f
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 8444 bytes
SHA-256: 91a4d387ed14eb827be3a097784ef7e80eb12e33f35e4a0b3701ca79ff2a0459
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10460 bytes
SHA-256: fd7201abb6cca9001b3ebb68ad93114f8b88a7a09325f95d1af0efdc773e0c58
font_03_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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