Malicious PDF — malware analysis report

Static analysis result for SHA-256 904a05f4f4aff7df…

MALICIOUS

PDF

102.4 KB Created: 2021-09-01 18:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49edd78305891eae7a9a20b80c880b83 SHA-1: 0586260affacb4a9b2095008d5bccc6deaad43a3 SHA-256: 904a05f4f4aff7dfc9619f4c46d9cf8d4320edc10ef2742d6277732b0bc7fd2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the collection of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://studionegro.net/userfiles/files/gelaroduwaje.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c941edeb90---33888819788.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/78231830179.pdfIn PDF document text
    • http://imaginove.eu/data/Files/63493016295.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xakanajelelazuxitevif.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/85943939332.pdfIn PDF document text
    • http://bamila.vn/luutru/files/49881364048.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/javuw.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tekakuvubi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/jibavija.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b224334f2---kivufuvasebisujeduta.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce366a3097---54563417310.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pugexegorenu.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/jominupuwifafikabug.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d22bc1f5---bazimor.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/82708288689.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/59811480914.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/18738121118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8aa8223e---97034436104.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/41558413231.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/39342996304.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/fakaxikomesuz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7add8f4b7---bilejimisisupuraxogonigab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=0+is+the+identity+for+multiplication+of+whole+numbersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 11352 bytes
SHA-256: 114299744782e956a95a5e6f217a7fbbada2ba1ab298e99ed6053d4e611423ba
font_02_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 19964 bytes
SHA-256: 448d22dcaf80a907b03d140c0dde9d24a6cbc1c6b3e362584042a9e097bd86e5
font_03_sfnt_off00016939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18146 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1

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