Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bca879591d2fe7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 03:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 217456d622f51d1b6bd02b9471eb478b SHA-1: 43278fb00911c9f06714509a8705d041c1858aec SHA-256: 90bca879591d2fe74f7529a73c1de97d4599886cac4ee0fe7d06b5c180d8e6d6
156 Risk Score

Malware Insights

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

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 0.9977

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://medvor.ru/uplcv?utm_term=ceramah+adalah+pdf PDF link annotation
    • https://culturasiapamplona.com/guiarte_userfiles/files/gutipomogan.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fobipogokajipago.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/534071297.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09f54dc64---7298491987.pdfIn PDF document text
    • https://signika.pl/Upload/file/vabidexetunexutipodopez.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502135700482232640.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/48aa737342675306c69dbe25b0bf7bc9/16390585727.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/1329033079.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/81113939418.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/24003824995.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-7/20210707085609965686.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/tuwijariditirerat.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ba1a7eb791ff6f9b72da444297be1d34/66930289147.pdfIn PDF document text
    • https://serka.com/serka/upload/files/71569855043.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b456750af9c---92937306429.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/95095568343.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/patoborarawo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2d347eee---xizewaxusogivugizusibab.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/78907732906.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/wumipavawu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vuvujajosupoga.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/415220815ff59c5a23f5e273af8dbea0/41288591707.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 17876 bytes
SHA-256: 16b6cec867d208015419845e42cb1d0caf9c44b07cdbd17092e099620f87519b
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 10212 bytes
SHA-256: c203a946f190209f6df9f2e7243f5e9ae8361c2940e6233975851329fd48ed3c
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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