Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a13128b11a9082…

MALICIOUS

PDF

109.4 KB Created: 2021-06-14 05:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b6b01c1315326d4a8ac429db6c0d5c SHA-1: 257156062a200472645f6463af0e352bd97ecadb SHA-256: e8a13128b11a90824497031f98c445b5f30d62771784ff224a9cb7f80f55e67b
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=shiv+tandav+stotram+lyrics+telugu
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f1f17fdbcd838622de9a639e51f979f2/66926652002.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607183b5ddc72---bibizijamitigotajatilotu.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6e445d7e---pabisu.pdf
    • http://andrelandberg.com/userfiles/file/74599625752.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/trn22c1njdq6o0n7p7ikqbfneg/jezoliniduvinasumiverole.pdf
    • https://zegabilisim.com/calisma2/files/uploads/zuxilitijizifa.pdf
    • http://sosnovgeo.ru/userfiles/file/15954610268.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6eacc33b7dceb2a8430fbfecd59588d6/82447703127.pdf
    • http://fittbike.hu/files/file/22745070769.pdf
    • http://acecaalcoy.com/userfiles/file/nunekiginekarajanixudix.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/sg4ma35jnjl2qkbuqos84knv47/87355987623.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a14086a40fb---ladakapejo.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb740afb9---41641347334.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160962cb83b909---3033739249.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16096397524af1---53749064985.pdf
    • http://bomtvcloud.com/data/board/file/20210513003352.pdf
    • https://t2sc.me/userfiles/gefowaj.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a59dc3baa---wigeroko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd47.bin
90c7c322960a60471013fcfef0cad4e3cb4a0bb9675241b1eab9800eeaa1c4d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 5616 bytes
font_01_sfnt_off00011043.bin
7539c611d6bbf292800f53b1914400c513a2f0e98b7bf442ba279c568c826bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 54452 bytes
font_02_sfnt_off000174c9.bin
af124a7852b7155907c047777d7a1187d29c17e4dbbb2c0d1154e702fdaaea78
pdf-font-stream PDF embedded font (sfnt) at offset 0x174C9 11472 bytes
font_03_sfnt_off00019a44.bin
f22868dbb55ce77d80a2c212466ba2aab241917a9ccd6ac3e4dd0e5b9493003e
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A44 3320 bytes