Malicious PDF — malware analysis report

Static analysis result for SHA-256 128d34349c64ef54…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 14:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f55d183aefd51b16c64c8ef300e3bbb2 SHA-1: b25bf9ec7e1e769e4990f2ee0c6e067ec8fba4d8 SHA-256: 128d34349c64ef543559a7f58533d1e7f42571707c8048c81af16a594e80a764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=urticaria+aguda+tratamento+pdf PDF link annotation
    • https://epiphanych.com/images/file/zaruvidirifeto.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075012a5d029---gutoposakibutefik.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d242c5bb3---lodibuberekewen.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8f339641057fcc0e9062e73dc88297f0/nipakezif.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/sp4marsan0sf8n5q4u7s30jo95/kavipitud.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4355f529d6---603223185.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/nudikufalovifirime.pdfIn PDF document text
    • https://cooperspick.com/files/62233871180.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ff239148---jabeketuwi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3f914ea58998cb5d1e1234c7aa0e2280/sanotoxelofigovepuzase.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8daa7b8c90---47510186825.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/webekokopuzi.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/wogoxiwapigodetirupujin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4783fd58---56416891225.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f623185c---fanigomufowedusediduge.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c626c8e2---fivibapuluzegafenanuwuxa.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/rawiwitolirawulu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f95d8f2c---jibebedivarefowekuxudeb.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5195b2a13fa26521b4785841fad5c83/rodawe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaca3995ea---pisubet.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/88246944515.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/rojalebusawuxefa.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/19057338066.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dajafoteromeveragefunot.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/54523683613.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/801d6924cb144ad13308ab66da7cebcd/mamikamivifamumawusi.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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 19456 bytes
SHA-256: a54fb278bb31d0aec06a027f4548bb2b509b6efd7b2f07cbc72f2718c5032380
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 10856 bytes
SHA-256: 205ede746df7f9590f2ad5456ca4be17c7ea0384be130500c8f4d874c97b8fc2