Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0512b617da3e836…

MALICIOUS

PDF

83.6 KB Created: 2021-08-10 23:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1c3f9a501b779147b9d41274794192e6 SHA-1: cd02cc2197abfc8babea43121f8e41743635d027 SHA-256: e0512b617da3e8362ad5a5a223728619b2107e687166d6b98cb745ad4f6599bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=free+printable+math+worksheets+adding+and+subtracting+fractions PDF link annotation
    • http://ansonseatery.com/uploads/files/fufuvuzuzokajobuzesod.pdfIn PDF document text
    • http://grabnerestriche.at/9202329705.pdfIn PDF document text
    • http://tipiland.net/upload/file/wixipa.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/suvidekotosi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/tininifidavidodofad.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/26439037754.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb23e09503---xuzabotitajejozo.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/xinenixeme.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/kofisoraveronas.pdfIn PDF document text
    • http://delve-cr.com/uploads/towej.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/likikatekodojivofo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kibufatesunejed.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5560c7a6---wejusojowutaxidigejomori.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a296c625e35---jadanitomof.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5487d952e8bd69b969eb31275db3b2a5/79829886114.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9dee2498---pukawogu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878b7e6c73a---bozafupatujilevemokenivi.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/48442670452.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/lugukifore.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b69b54f485e68c7b44826ab3d26c753f/bexivisusijedufogexipof.pdfIn PDF document text
    • http://bscartridge.com/pic/43182279753.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/58268662260.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16500 bytes
SHA-256: f1b8ebf14e37f714b336887a7caf7ce42d0f07f7de1b6be8c7b14350822c9cae
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 11460 bytes
SHA-256: 7cc1212dcd0667f2e96e5ce57dc514a04de7478a3c37d8c7a55deda90d04162a

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