Malicious PDF — malware analysis report

Static analysis result for SHA-256 b716a3129b7bd676…

MALICIOUS

PDF

92.0 KB Created: 2021-09-18 07:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df6e482b2c6f71f2126990890fc19dfc SHA-1: 76878c3d7450c467f81423de1d10c45d3fd4c60d SHA-256: b716a3129b7bd676179d5efc688c754aa7c3def9d2ab777a760470ba32b4ce91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://odra.cycling-recycling.eu/imgturysta/files/sufoxubibus.pdf In PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/salafevu.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/xenekoju.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210915_225101.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/19602563323.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc805a8518---bijadowetexil.pdfIn PDF document text
    • http://med-os.com/user_upload/file/fowuxuzosediranebul.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/95053373852.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355151dc8e4---85730890333.pdfIn PDF document text
    • http://www.moyekolodin.com/files/22129185730.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/86556436155.pdfIn PDF document text
    • http://stylekd.ru/files/11381344102.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/63105500556.pdfIn PDF document text
    • http://www.agot.pl/upload/file/monizipurukebi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/ruvigam.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vizakinutanopok.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wajuge.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/170fa8a2e8a43b02500536cbb28ca1f4/10492473453.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109170107128476.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/10595699309.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d60efc0591c85f890706bb88e2d4dfaf/92536735913.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/40684652205.pdfIn PDF document text
    • http://sb-78.ru/files/file/94392948447.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+%E6%90%BA%E5%B8%AF+gps+%E6%8E%A2%E3%81%99PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 22344 bytes
SHA-256: f6875a03dfd34e75f8401c9648436e0b4e9d0f0970a676efa9042bc42f48c7e6
font_01_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10108 bytes
SHA-256: fb1a408f871ca963c3d9b401c8dc3f60415df15f640e74374dde8c79b44e1032
font_02_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 2520 bytes
SHA-256: f740db6ce69dab6316c595b0990db827be665a5a3bd585c4789da252d57e4f1a
font_03_sfnt_off000147fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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