Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9184c222e6d99e5…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 15:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82f66512f2ddb730550a1460775138c6 SHA-1: 70bf27c31670b0be3362c63847b0e9c73af011d5 SHA-256: c9184c222e6d99e5a78dc6dc019c191153e77327a2d4cac2e49172affda6bca7
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing embedded JavaScript and a large number of external links, some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be a byproduct of the PDF generation tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://boldogelet.hu/media/mikivagirusomowop.pdf In PDF document text
    • https://micro-logic.ro/images/uploaded/file/89016499381.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139057434286---7872104260.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/31455293635.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/66253446123.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/9532355867.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/91560094648.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/84350488149.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • http://mobil-tech.com/files/38571769626.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139415cd62b7---dajudu.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/83250312173.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613e64a90daea.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/42660160093.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/bidozutulazesukafodegakog.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/39045961824.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/12702612146.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/91032482893.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wamepuxo.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/gonafosinufabaxududatud.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a90f08cb1---58783127067.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/xomewaron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fun+with+ragdolls+android+free+downloadPDF 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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 10796 bytes
SHA-256: 894d08c7a07171b298c14ce3b9e201c9f3a45227b302e8e5cb402dfe1452220c
font_02_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 14280 bytes
SHA-256: 99fd99410dd391d08429b657455baae840f3a8d1dd1e9709d9665ccb55e88865

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