Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41d82369c623f37…

MALICIOUS

PDF

92.3 KB Created: 2021-09-16 20:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03432872700f6aaa2f9accc2dc56a876 SHA-1: 3967c17240a4a05bd1441959d8f1158aac900904 SHA-256: d41d82369c623f37939f548e80a95597db967af6f17433e079845e8439a3293b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by PDF_JS, further supports malicious intent, likely to execute further malicious actions or redirect the user. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kredoteka.ru/uploads/file/kabokelusagijesodinagoxax.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/60856273968.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/salow.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cimikjf0ledsgb2qkrlanevq2j/86623693194.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84945418380.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/91024816876.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/paxexiwam.pdfIn PDF document text
    • https://mauspro.net/upload/files/33931536533.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/lalonevonijewobis.pdfIn PDF document text
    • http://nova-auto.com/upload/86755457742.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/viwavisevijalaxori.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/250e9596a4617a230d1fad44ac3744eb/27524054754.pdfIn PDF document text
    • https://hirurgija.me/files/zizukebinekipomoxosex.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/daxerobaligokuzug.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/vetupiwerilunik.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0cfm1859elrqhog11abi43peh1/nazavipon.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/genogizuwu.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/8566081084.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/rugizomanisuvuzavuvode.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/32650516287.pdfIn PDF document text
    • https://cardolf.ro/files/25881978886.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/41017624623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=us+full+movie+fmoviesPDF 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_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 17228 bytes
SHA-256: 5950278945630f121a6ab13a439915ba3a98d6dfc831503f43328f952188f62a
font_02_sfnt_off00014d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D15 10084 bytes
SHA-256: 60bd228025d7357709d0d36bcdc7aac360c31e2fde770ffd2b5e5f021ccdbfb2

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