Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bbdb99619386ec…

MALICIOUS

PDF

76.2 KB Created: 2021-07-27 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50abd4baf0bc06a92a58761e79e2519f SHA-1: bd789d569932a25dab7a13bcf920dbd9fc9225c6 SHA-256: c7bbdb99619386ecc80b0622a2026a4c30c45165e3bf11c3e8ce085e8f3c0f0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wenxuezj.com/images/File/88769624102.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/87509301579.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gql9dkpjnf19u6sd984f1pfjtr/pomupofamet.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/lujajemaxagowosoluvem.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/pufuratirex.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h8f2qlp99l863auc3em2ufo2ta/nulonarusogajalefigasesub.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/70895876722.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/11086181744.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/pipuketagukejabowugim.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bf08ca97---23844176972.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/87a992b3d12d824a6e8a319c24190b46/beragekonomixikiwopakufal.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/wanobizinaj.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/wagivanivaladixefediwi.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/74304314023.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/lezus.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e69797f41627c49f9d1c34849e64a0fb/besoxije.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210626212028_rv294g.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wetupudozelajewajeruw.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cbfa53466a462ef6172d88499adfd23c/warifafakife.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b053c51d88f---77253819346.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/76be2dfe582dbcf9569cba0d6d3abe06/xabelegefevosugejavew.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2b88054435468c5acb3ac18c0290ba0f/32021434187.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb872f071ad---xuzolukef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=earn+to+die+part+3+hacked+unblockedPDF 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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 10928 bytes
SHA-256: 4d3d34e694d4a989cd2ef5683d048f7a13d25fcd84b039110869865001f88a73
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 17180 bytes
SHA-256: 35b85e9e8d19fd82a68d8272c91cb79dc40865d4f81dc6466cb7f99a03013ddb
font_02_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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