Malicious PDF — malware analysis report

Static analysis result for SHA-256 4045864722883d4c…

MALICIOUS

PDF

84.3 KB Created: 2021-07-04 04:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a246f579ba889102d005d268034e4e50 SHA-1: e49aa2c669f166f6c7f59baa3435f144c8019524 SHA-256: 4045864722883d4cfa44d5354a8a4b629a6679e1bf6d0e1c264778efb19b320f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to PDF files hosted on compromised WordPress sites. This suggests the document is part of a link farm or SEO poisoning campaign, likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=inflammation+of+the+eye+medical+term PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/81b467476b5f05caa36256cfe3fdd20d/konov.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/47bfaf92da36a7afc7d39e45affe781a/15728691934.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/26184220131.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/puvotudulewolipufako.pdfIn PDF document text
    • http://megalaserasia.com/upload///pemalipeva.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5ub5e7r5ml92c1vs88a50dot13/zadogaduxexubepojegas.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/nenapuwikoxegeja.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/88056481049.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce93c4ced---miwuwixem.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/43f969ff018c4bbe7456d67374b00d2f/zitenunoxesom.pdfIn PDF document text
    • https://abeess.com/userfiles/file/4505507164.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ecf1b588---27175915485.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f4c7fc71---972755455.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/tubeledazaputoriwapezorun.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41ba7ec4a---lalulatil.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/01776e79b230aacdd1c92b10b62c66af/gipivavefimepob.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/3533005010.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/05vh2vmljjr0q85glhkh1b0n98/dewosadekiruxaba.pdfIn PDF document text
    • http://azizolace.cz/images/file/89380367806.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607135da8c641---37303565664.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d73a13fa4---luraji.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0a92423f678593e2bc9891875bfae45d/lijaberolazalebuzuselaji.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16568 bytes
SHA-256: ad4887d602b1df477f33e6bb6665bb937b9b09f44fa49cbf32816e491efc5403
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 10636 bytes
SHA-256: 4b6bccb71eaed43514e6c0b1da18a89b382c98e63def976aaaa146eee4f248f2

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