Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6dc6d5bd0a7602…

MALICIOUS

PDF

93.0 KB Created: 2021-09-09 06:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a27ce0141cb25b38a5f31572d86db060 SHA-1: 373009b9ea77faa308c6b4b44d6b806ac6a8d4f9 SHA-256: 8a6dc6d5bd0a76023658c88bc0b37f01f87cc98bf32d4e6368d048d71d7b5d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=como+abrir+un+archivo+epub+en+android PDF link annotation
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/70050260343.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313df42b642---84162060614.pdfIn PDF document text
    • http://cutskytools.com/d/files/58679460067.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc532326---74744044041.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/23403685493.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2abc6296b---26541592636.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341909cd9d4---5839315209.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/pazifez.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/45363287007.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/82725320594.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p64utvct2j3jhrr0o1ivtsbnod/kevodovarawibufasewos.pdfIn PDF document text
    • http://goldmustang.com/files/files/nedufepimegeranatenopapod.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/fosaxatinusu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/11082891036.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/27744295251.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/38652215083.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/fuwiposoporanopop.pdfIn PDF document text
    • https://btegypt.com/file/57136986744.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4b27e3ab---74454664715.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/713fa0a9dfedb4649fa48576ac8349a5/dagukuzixurobakarewedite.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/ziwemelit.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/30621527338.pdfIn PDF document text
    • https://olterus.com/contents/files/12825671842.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/87271722363.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_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 19432 bytes
SHA-256: 48de8e775a219eac5deb84e3da17ab215ab63c48c5af4845cf5ecdd154c792ab
font_01_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 10804 bytes
SHA-256: fbe56a729aa5a0d07df2b3c596c3be6fdf8d78eb34a48be4f174af262bc9afd1
font_02_sfnt_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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