Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b52a01b109baa6…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 15:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843e9c6c9d6864f07ad789f1ebef4f71 SHA-1: a920aa07c2d2b58adaa454ca04d50211651375f1 SHA-256: 71b52a01b109baa6a9f5f536a4be46421744b791de52bd2b3952768e50538b30
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. These links are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b9dca00d---lebekazisanetowelaxobi.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/848288ee2e135dc96465b0531fe517eb/libodalesepumumoba.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/7afbec7ede67e80b958a4f9db7fa82d2/rilemivasuriwupasesikaj.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/sijunejujaboluxulezu.pdf
    • http://magnachip.cn/userfiles/file/20210512050014.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbmn152fes5jlovngtmmsfn88l/zimovova.pdf
    • http://3xlove.com/uploadfile/file/gavidugidasevezifelodelu.pdf
    • https://codecs.ro/images/file/videpelurererotugejag.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e1b3d2e2db9a4c21fdda9118b25bc0c7/87436336527.pdf
    • http://akkoryazilim.com/userfiles/file/17646600256.pdf
    • https://systematix.pl/userfiles/file/nikelavikomugijifuvijene.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0d81d8cd---livobib.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c9ce70fb---43023394189.pdf
    • http://russkiivopros.com/images/FCKeditor/file/35531893724.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609def530228e---wolasemakomefefazigud.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d44b0cc9---69659308199.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf270f522a0---82456145902.pdf
    • http://diversecityuk.com/userfiles/file/8638993274.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iskokani3692bd6s853vthvv45/54151527952.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0b8bf4b36d081d06d88b6eb2329574a2/67577282317.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074779e20589---kegesenanomijap.pdf
    • http://alibabashipping.com/userfiles/file/manuvenubuloto.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d743c6ad1---1467350002.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parable+of+the+seeds+luke
    • 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_off000112fc.bin
ef57cc71508713be17d5f5115388c156ea6a3b304b90d6c9556814f0e96a90b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 10588 bytes
font_01_sfnt_off00012b55.bin
eef83e05bc1bcd792ae1bb570364de5a34738f8f0487b9da3b1b3f5d76a93fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 17056 bytes
font_02_sfnt_off0001574e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 16792 bytes