Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f7ec8bcc4b0721…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 19:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a73ddc227c506cf3239f5b0b6e5d624 SHA-1: 1b8838972e25989950eaadc5891a02082af7bc58 SHA-256: 61f7ec8bcc4b07216c807d96d4ff171574c411a3c0d2028f215a4cee7f22e617
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://horkolas-gatlas.hu/ufiles/file/521823090.pdf In PDF document text
    • https://totalsewa.com/userfiles/file/kemowotezurojaxi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kh1nivdatrt85hin6pa5r45oj0/bujimitewogojid.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bupedimilisege.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/jekowuk.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/29876580648.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/79137528103.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f08df315---lazexabukubogimi.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312331518178.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/28421525464.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vsl8jh569nugfoqo0k914nmt7u/93082923697.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/69455405161.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/kagujusurosowetevufumu.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/20412289859.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/28564772058.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/2823024971.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/gilisalikekijorod.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/16597197928.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/86237776517.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/24531495724.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980cfa1ea1---24164404939.pdfIn PDF document text
    • http://e-sheremet.com/img/2010707477.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/sijafaku.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/kaluxovivapubudarisopem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=khuda+hafiz+full+movie+onlinePDF link annotation
    • 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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16960 bytes
SHA-256: 393afbffc645cd3403bdf8941f914f222e2c2cf7c7b7d290fdaeff53488ed933
font_02_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10472 bytes
SHA-256: f5549a98498d6b9f6d4d1e7ba8f65e2239c1b955c11360fdbe706a6f2b3655fb

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