Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a90dda317ef3d9…

MALICIOUS

PDF

69.4 KB Created: 2021-05-06 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2c5a98726ebcdcb9cf48ae90d92fb4 SHA-1: f1a08ca3d57dc8530cc3cbd45a31e9715f0be54e SHA-256: b7a90dda317ef3d978a89ae7974845de008d899650d2f603c9e8a887ff39beeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8136e43---wagarojimolojovidozak.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b48f34433ead3b74ac96c0ae87b24613/bolewuv.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0riht308gkrgrm9q1vf8sd49f0/vimomebirewuxojilutumagoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119a12becf---68838680133.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9fd8e4a4057ad0bdf0798a6e36457236/sawepas.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/kimara.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20e00bb717cf3adf241d830e75770e94/wozum.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f5044629---15340191327.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a4adfe0b2eecb1f5cc1caa72e64e7316/54190004218.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160716bb365b35---meroxuzitenubuzabav.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c0739939---wadujamugoxatokem.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2527c08e8fafeab1868112dec0cbeeab/tomelux.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607833b7ec271---92297626979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=vsco+cam+latest+version+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d328.bin
36400a8cfe16b36520526852be61d18cbae4b41208fb6a3cc47f11a4380f25ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 5168 bytes
font_01_sfnt_off0000e4b1.bin
9a8fd389186f1ae603440486fbcc179675201306705a8f0068ba8ba3f3ddb297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10608 bytes

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