Malicious PDF — malware analysis report

Static analysis result for SHA-256 846d6d45053fb716…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 16:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4c15d1892e746ba3b3d5f8a5e265f8f SHA-1: 8074f3c61507679a9f94737fb98e1ec7971b13f9 SHA-256: 846d6d45053fb7161111414046c9e05d72e597fb90b83598dff1f4084e26744d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The presence of numerous links on potentially compromised sites suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16091226ed593c---bokabujusosalex.pdf In PDF document text
    • https://allmassage.net/upload/file/20210527195451.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4025fdcae1f4661172cf136d84f11c88/xosezuzidigepe.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/zilejaxekajamok.pdfIn PDF document text
    • https://bamor.org/userfiles/file/15120925115.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/tixipizufagamaxavamewole.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6571895646---5525283566.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/sivononire.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d27290c1a6558500b1ae53e7a0c1bf5b/86450029648.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/nng0kg9laufmlphsdmnofe932l/12991266089.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/dasezipiro.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/xavivipurefujomisaxuz.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/13761627014.pdfIn PDF document text
    • https://alpinashop.bg/files/67850008521.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/5801477614.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/zurinuvutit.pdfIn PDF document text
    • http://enricobarraco.com/files/99386385989.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720644124ca---18777621396.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160def3a513b73---sejedububukufi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/12697108685.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/xijagesopegefakizujo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/ruxixewatigamoxatanibu.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/57724552492.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tuzepoliwepaganuwovido.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/fe6029a57e28c458fb1504a56e143088/86341530907.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085905b1faf3---gujasabovunutijut.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/padevuneranawutekigino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+last+witch+hunter+full+movie+onlinePDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10816 bytes
SHA-256: ec720f26e62bc3b1fab14d087eb502018562df42a88d41af2c0f7199c1615fb5
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 17500 bytes
SHA-256: 3595b4b1a47cb778cdc29cfffcba8aedd4f47ddadc8bda00c0e84852f5bb08ee
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1