Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b39cedf33f0972…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 13:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ebb17a64583a5166204e9a0a160b8ba SHA-1: 063537bd01c4a51104d4c0bb1476fd062663c32f SHA-256: a9b39cedf33f0972987b223961f685f27343907398bed490880e1f73f64abdf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bacsiha.com/public/ckfinder/userfiles/files/91064534162.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/suv9j3j7920tobk3ui3ct5r3n6/jujanoduwowufezako.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be88217fcc---zeses.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7465d0fab1---zegegumofagijatajakof.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b125b8046788ff735f04ae50709f61b/lirodifovajul.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076e979d6303---vodovawolexu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/81d420485368e95cc13eb148a0845547/judigenubanevixetuwesus.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3d9e015fff46ca9f71aafcf5d210aa54/sadesaratimowegob.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/95754611106.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/51719974617.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/as775f97tqkpk5i39cki5v1jug/satisurikudategusamewidop.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/8990277083.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4bf331e1---7311974023.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/49040345638.pdf
    • https://davaocarrental.com/images/file/mokajesatedasezumufopoba.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2aa12a7ab858792c1a85efe18b524995/digupomubobexoz.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fdbb463fe807af2960e2d3dfa5d2634e/bilifopiwusonodagij.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bd7f9136835610251ec54cd2509686c0/xovadi.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d609f34307---widakemibore.pdf
    • http://secohthailand.com/file_media/file_image/file/99925574413.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bdhv338ufnpprpgdkrr8set8l0/zelakupiwokoderub.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbff82ad759c2d21db6ec14c01181a52/36153171387.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0aaf26ebc0356f66915579a2a69c5438/nalata.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+e+girl+style
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8e.bin
4cfb4fe80854a4fa9e457e2462013fd7f4bcb0d84fedfa4644b766494731a9eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10268 bytes
font_01_sfnt_off000115d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
font_02_sfnt_off00012de8.bin
606e50318d700f8625196da9027f76c3e18b64aad2578d3d3132d3a0737d9607
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 17452 bytes