Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ec086c8abe7188…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 17:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 86f1c1491338f32016a599ab2afe2551 SHA-1: ff68673a2f7c0344cdf34898ff94de2ef03d1093 SHA-256: a8ec086c8abe7188dc76c6501d5fb0425dd279479af8444a5630331ee8fd0334
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure, likely intended to redirect users to malicious sites. The document body is heavily obfuscated, but heuristics indicate it's an image-only document designed to trick users into clicking a link. The presence of numerous external URIs, many hosted on compromised CMS platforms or disposable domains, further supports the phishing and malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 0 text block(s), carries a click-outward action, and is only 69 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://www.cenlafilm.com/siteuploads/editorimg/file/xosolibokapujisawu.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/14201283056.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/46411642473.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16135d28ca33a0---24267886178.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/dazosok.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/34771085404.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zijesunadixagiborejopitor.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/mogufuj.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/28365728390.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/86019347699.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ace5d6fe---gatovatagop.pdfIn PDF document text
    • https://curvy.tw/upload/files/poxelavija.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/66451565092.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/38296335795.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2f64f43e4e07a6c088634154a1b9d2de/9304606575.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/zufisoxoti.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/47103019772.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/vesedasuv.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/zanojanadat.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/84497387561.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/9266c2493e3b2458b0dbd99c932b8636/83208084501.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/70095263295.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/jerasojubada.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a06b7d9a1---22822790629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+galaxy+s5+tablet+price+in+sri+lankaPDF 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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 11352 bytes
SHA-256: 0f6ae66af2d26268f72c1f5ec9febd991b6c13115003510b68c17ed89a4937d9
font_01_sfnt_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 13904 bytes
SHA-256: 21850dca8791288e969c80b6f1497c8957b7b7d4bce5dc2a4399bf26849550ce
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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