Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9215988da8eb73…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 09:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f4aa17126178568e29133c1bc869b5e SHA-1: c8dabfebbef14718a4612cba485182609ed83da6 SHA-256: 3c9215988da8eb73c7d848aa604f04ee2c8664972c3e7d1af396e77349202787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=pdf+to+doc+converter+free+download+for+android PDF link annotation
    • http://hiddenroots.org/clients/19739/File/fidefutonari.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/95934047589.pdfIn PDF document text
    • http://www.celso.org/download/42184641285.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/65233689027.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/16316591046111586386425.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/73400439652.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/8qo4h06lur801h9s4aq4138oaa/55026622477.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/bfa0f6eb38cf5d6fb22cc0757eace337/govazisepini.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/pujororuduwig.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/64154172595.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/29904840782.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/19035902254.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceb9e9b9d---67155438249.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kololadin.pdfIn PDF document text
    • http://chinazzjx.com/d/files/vekilafunakodefadi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/verotorifube.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e3f8b39e910abb8e5d9a3e7ca381001/zaxokakidataro.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/sujer.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7kb23rpqoo0907esmhn3p4sb4k/zanavupufit.pdfIn PDF document text
    • http://vhshf.de/File/24260147396.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/faresavelonutotenavop.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a892bc93159651c7e0470c49718c19c6/nogurima.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/55f3c455cb4fe064ec29a8f8257e5260/wigovadudogujujejazoruz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b8a0392cf9cf3375d5a357ac3bb59c36/9645093565.pdfIn PDF document text
    • https://seerupit.dk/assens/file/todizebikigufewamamozibo.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_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 10456 bytes
SHA-256: 773dce86ad414ffcf18600fe0181ab55f5db9a4220ec783fa28f6683edfc889d
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16440 bytes
SHA-256: 2c74437615d63989faead9e1479b4ba20a460adecacc68917dd762dafb59ef83

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