Malicious PDF — malware analysis report

Static analysis result for SHA-256 936e0fe1d77f5044…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f238495bba20eca1f5343aa6c52c865 SHA-1: bfc00dd3af56e1e3446af9fe63581e08ef58cb04 SHA-256: 936e0fe1d77f50444d9910a716875e05c69ce4e1dc8fa13382391e5fa15b2b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1kvv6kei432r11l8ls3qd22hbi/fitepetopa.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/41fb50cb5cd640f2f9417f190e72c374/bibixisejiwatamevi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/47475244283.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e816fbb2dd0---35846674432.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/10/namapababixujipexuvol.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46054128297.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeca548ce0---namanirosuvitiwamiruseme.pdfIn PDF document text
    • http://arablift.net/userfiles/file/77648506085.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/74617915717.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/wunoxobokesurawomolidunes.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a907c4d82---91591995248.pdfIn PDF document text
    • http://roocenter.ru/upload/file/80302289799.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pelomixakelezifovuv.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/59864371284.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ea2c58c7606d4851e9a4ca47d3022bdd/53830423704.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/kidelewebegenitidon.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10f4520ef---tarorowowosirenobajujigo.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/48540710387.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608823a0e7606---31368915760.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/tatekapup.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/42982825871.pdfIn PDF document text
    • http://pasted-radio.de/web/files/17077131655.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8da70899a---desasetoxabo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kf8sc488tr8h17b2hvff58sfqc/77112139038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=food+and+beverage+director+job+description+pdfPDF 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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 11060 bytes
SHA-256: 96ff899bfd81cb4a3c53dc27b5032996b733da48b284f45bc3d43d386d43e1d1
font_01_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 17932 bytes
SHA-256: 653fc1370281b8efcbe066bae069bd29d7d0b38bf2cf2bb663f40944777b830b
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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