Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b9699c19a80411…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30881f47acabdd01d40cd58762e17e68 SHA-1: b415aa119a76591260348c1040c414798a47865e SHA-256: 36b9699c19a80411ffe0c8a878a77d23e8effaace2d50c1dddab52380ce1039c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=iqbal+book+pdf PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5685173---672516873.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/33725479541.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xunopajazix.pdfIn PDF document text
    • https://webaprint.be/img/file/87322829427.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ea84319e---75192973628.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191608.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/mekad.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/69924376511.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/50127321633.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210621060938.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/jafejisogogigas.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca9c4c5f3---57814912517.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062008341173499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8af9a5e71d---junuravoxujadejavikizok.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb62405c---texajamo.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/44430794843.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f2cb2da0---lulezekamararonemalag.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/50859989427.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e9d2099414aeaab7d2ab9c2cac46c69d/51117059989.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/junakapinisikifekipi.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/22297139429.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bade2eccfe87602003c0ecab65f06c2f/71760676110.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ef894769616c9c24118360ee7077ae72/72249156054.pdfIn PDF document text
    • http://robedecreateur.com/img/files/guradu.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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 18088 bytes
SHA-256: 6814f6247ccf5289aecf2715214c355c3ce644b524e9ea4ad26dd5a4b0d6564b
font_01_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 10128 bytes
SHA-256: 538235d3f141716096d50e419543a2d4ee8eee0799ae370a6dffd624cb0ddbf9
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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