Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b85918cda6ee312…

MALICIOUS

PDF

85.5 KB Created: 2021-08-02 09:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de96f68b76ca27d84573d8e5e647041d SHA-1: 7d6140bdef344284d93a9fbdbbb69035022a7e21 SHA-256: 9b85918cda6ee3128589c69f9955a7fb90df446b116ea912d34b33024627451b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=what+to+use+to+lubricate+caliper+pins PDF link annotation
    • http://hostsolutions.ro/app/webroot/files/userfiles/files/94824084814.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/madibinutolaxuxixawa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02a68746b8---zeloboko.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a22401b5c30---gorosakifimopite.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160842c6a6c421---88940928328.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/tenenopufekupesuxenuval.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210719201035.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bb242b86be6---58455680383.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/xixibutedovezomape.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8e0b779---18002693209.pdfIn PDF document text
    • https://brakos.it/file/45100161361.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/12399556059.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210628040709.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/70526316028.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/sumisovetatoxatinip.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/44666880300.pdfIn PDF document text
    • http://labonscafe.com/userfiles/losobidodene.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/duguputumes.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/20970748512.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/jagumabiwasopemenow.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/wabadiwadavam.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/levanijopamezosulude.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/fubene.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210623_BB8B451E248999D3.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 16756 bytes
SHA-256: b27c897aa38c65e29b03ff0c40ac7a4d46a6ee8f5195aeda6fb1891560427b3b
font_01_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 10704 bytes
SHA-256: 0126a751427969c910ee33db3f48d5c08d8ffc5bae9ba705ab51bfdd9173e99d
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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