Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ffb30761d82215…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b569111acceed9ce80b493efa3d465e SHA-1: b065e5fa043274f9a2ddfcb955cd6cc10d403b88 SHA-256: d7ffb30761d82215e847d0fda542b8d41ba9c408bf42cc74ed6618513ecb5d9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to compromised CMS uploads and disposable domains, indicative of a link farm designed to lure users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier assigned a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=gta+vc+android+requirements PDF link annotation
    • https://searchkar.com/ci/userfiles/files/suvewozirawizi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c966dbf98e---28136813040.pdfIn PDF document text
    • http://change4best.ru/upload/file/medateminejorexoneke.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/19676983740.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/tomidafegisolefen.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a4cdc9e---10006878438.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/naxujizuzosegif.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/94038954307.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d173207c---lunuriwoz.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/14833132987.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/wabupusufumujebis.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/wadiketenupizofotokobu.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/40660463172.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d8db5ba9---99312076416.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/92921626351.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27581439798.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vufulivosopivijinufivewu.pdfIn PDF document text
    • http://cpviettin.com/upload/files/mujopaxenupesuwelozus.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bk7phcfk1pl2n8gij0lak5r9fd/gifipejaf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f79b0ef5b---lofab.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/65384400908.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/29043015156.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nezifakuwivejokifubinosoz.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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 10836 bytes
SHA-256: 663c64d1514d48cfac72c6ef4a6dead6b047fe4cd9b3603fd867dd61a73d7ad2
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 20428 bytes
SHA-256: 50a6d08f67c244bf698342b22fdd5f7d72df32fa9794ecc54ce586e85f54fd9e

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