Malicious PDF — malware analysis report

Static analysis result for SHA-256 267c5625d0116acb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 16:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e7895821562399b00053798e26f1c92 SHA-1: a413469f5a5ecfe191bcfd9d17d0fc22d6f68c12 SHA-256: 267c5625d0116acb868fc470d0cf9a99492320f06c3b788a54cc50079dc00c84
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, designed to host and distribute further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161380d50552ed---57461898421.pdf In PDF document text
    • https://85097781.com/upload/files/litodikureropefabikujised.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/90587637318.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109010048098205.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lubezamo.pdfIn PDF document text
    • http://langyupharm.com/upload/files/bofunevinawejukefoketuku.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d725286b8---42702265222.pdfIn PDF document text
    • https://temahr.hr/files/bidarufafudujosovo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sifunipukiwavozojobena.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903010916102596.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/lobamipumotufovitak.pdfIn PDF document text
    • http://shopabrang.com/images/files/figoxosimitebajokuro.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/96643914237.pdfIn PDF document text
    • http://iucecb.com/files/file/rakosusizul.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1072d8e1e---10929843482.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/junusorax.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/87197607194.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/wulezapakon.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032db452b6---66194624553.pdfIn PDF document text
    • http://freetds.net/userfiles/file/lusozuguvamulevopiber.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/281488884.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/36920532342.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/femodobugowerivit.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/bamuvopoxeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+family+locator+app+for+androidPDF 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_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 10948 bytes
SHA-256: 8ff0f9394f10abd8e3fa2249e9beb6deadc45b0c1fd2f9c3bdcf05e81618ffa3
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 17592 bytes
SHA-256: 844a6fd0e7ad94e06107fdc95334e590eee7b6233872ab68764c9d7647a2bc14

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