Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43d7c2c16d713c5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 19:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cdf67d93bc668897023d1f34f2a0b49 SHA-1: c30011a94aaa826c20d227f7c808696b49bcfd58 SHA-256: e43d7c2c16d713c537200b4179c9bde79d279d62cc52f95ed6b3358069a80c92
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 are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The presence of external URI heuristics and link farm indicators supports the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://platypusspot.org/uploads/ckfinder/userfiles/files/2022139926.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/46793697247.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/binuzekodajadedal.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/bivakafafes.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/70804342659.pdfIn PDF document text
    • http://benetalent.com/upload/files/44438728287.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/62586086658.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/50267462230.pdfIn PDF document text
    • https://italvaping.com/file/domubozosoxefinoguga.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/94164499332.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b901e473ef---nezoresuroxufigez.pdfIn PDF document text
    • http://leeandrewdavison.com/download/gamat.pdfIn PDF document text
    • https://servauto.fr/img/user/file/10785222780.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/bexejimikejevowa.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/27261713084.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16be39dd---duvalurativojifiko.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/gifojexazewobezojinix.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/65269403386.pdfIn PDF document text
    • https://lazerom.pro/media/file/laselurisu.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/36029396765.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e5e8766---butamoxev.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/wumef.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/61832230461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+convert+a+file+to+pdf+on+phonePDF 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_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 10692 bytes
SHA-256: 8c4fe8438b99c53f0e2b7a55078ffd455855d1ca25c7a2a533401f06513f47a0
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17628 bytes
SHA-256: 836d755d72114aa4b20bc25dae8889a22873df81530426654c5fc227a582a669
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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