Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c2fcba945a4a0…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03b056c468027560d3a184aad1640ac9 SHA-1: 0e909d3efda6e4219b34941cb91220cdb3b59261 SHA-256: 845c2fcba945a4a028f74956efe66bb866cc49b118440cf18fcf2de9ddedec48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, likely for SEO poisoning or phishing. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b000cead---33921523969.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m43ma0ao19i20a8e1ehbt8fd02/jefilawifuvupanerinibuw.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fcca0d5e49b4b4f278c73e5b5505ff8d/40060041828.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/32485968926.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7394cb0cc71c02ed5a439115a40e08/dokoxovejelilitapazekeka.pdf
    • http://msslink.ru/userfiles/files/49333105367.pdf
    • https://hotel-la-licorne.fr/userfiles/file/mimusuxuviwope.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/jelixifufujaragasudo.pdf
    • https://oklogistic.lv/upload/file/rotigokefugekovuxulogi.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9b1a8b20e28562696e35692d88c434d2/xuniverabuvere.pdf
    • http://bestbuyfromindia.com/userfiles/file/zusunerufotulilebukixawi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b4055cbd---tugididogejevefimono.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/50785388a5d9f1330332d9ad3a1c994d/59729844450.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5861a3e4db048a24fd9a5866c77fd5d7/46815525127.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53a9634ff---85549145921.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=inguinal+hernia+swollen+lymph+nodes
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da77.bin
167eb535952d1b7a49fe7fa653864d981fbc52d434e644e77fca4449eab23b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 15708 bytes
font_01_sfnt_off000102ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 16792 bytes
font_02_sfnt_off00011b16.bin
fe2c154d3cdeeccccd8e56413938cc117da16aa0ff26bd396de1f6d6696b3e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 10992 bytes

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