Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4564d32f8812a2…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28048d21e6f18506cc08581a7551e4f7 SHA-1: 49fc7541ff3719f3da4be434ecaa8dedf91f2be1 SHA-256: 1f4564d32f8812a26f437f131648e2abeeb0abb9bcb78aadaf8a66c681f483b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=copi+introduction+to+logic+15th+edition+pdf+free+download PDF link annotation
    • http://progfin.pl/userfiles/file/45138946262.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7itc3iaoeb0bne0b3k99daev7/41766137169.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460e0dec6a---mumakuzulozawijiz.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a20172596122f73e0abcbdd9feaecd6f/silixibokomixogodalenag.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8ac173ca---69826214151.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/gumewugewivorajodod.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070002dd0ce2---79388923119.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/zomazonogoronapovufan.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072921143164.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/24974197506.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/3011056965.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/deduvuladupaku.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c62ca59057fde165c876268115bb343b/jofaxunijubajarukur.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a794068e5400ede4084e194505075e58/piwirekiko.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/80420847685.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/kewadofegakubojukovizipo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/mipurakuzanefidevewes.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076245db8ff4---papopupakojetirovifi.pdfIn PDF document text
    • https://fultoys.com/userfiles/36860918610.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/69161091282.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9027b88dbc8406501cac173cf74d314e/5155979967.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/250857856.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/86869580778.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/74093677029.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://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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 16908 bytes
SHA-256: 02bb1241b406a83062705ffa4848075dd09a32fcfe0bda153b2acf11c7d7962e
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 11132 bytes
SHA-256: 65014c11fd498200a50d3f9251b944233a8da3848026e74e9a12476980a652a5

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