Malicious PDF — malware analysis report

Static analysis result for SHA-256 835bbd028916e2ca…

MALICIOUS

PDF

171.0 KB Created: 2021-06-28 05:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb138756a2032b9b12a073ba22f8b70e SHA-1: 619677bad68a31d08e13905f5363aaa0f5999408 SHA-256: 835bbd028916e2cafa0e7f1e2e3fa891ba447f69bdcbddae8b613faa79e0e895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45e641f2e---bobepugetagemisamuvipan.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe63c97e78---lenaxabimevogovanefegefo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/80356197330.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mgbngeeohvh95dst9d7o4f0lum/38008823337.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7jt46vl580nhgqveasrhar3oad/90954196126.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/86a31f438d0671d2a3c5d5751a70c184/88978575580.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rj637arptbbj5bpu3jnbusp8j7/86647061043.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/47683972880.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/74244214293.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/muvasopakikokofulezosoge.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743d425b8b---67657254049.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cfce2ab5---weloken.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbae5a7d8---91038226519.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lcn28niq2rkc60nqn5d1f2qt6i/65278783909.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160723314021d4---mamerusoliserutibebojo.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/46851299780.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/79361545603.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/12310691498.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/84251204319.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/39685357415.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///60495280496.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/49785766444.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/81402280306.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/sofemogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=west+point+tuitionPDF 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_off00023cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25512 10028 bytes
SHA-256: d47bb0443f6dba6311b0c2f96c38f3ca7b09b1cd0967d8232764b11555edc5b3
font_02_sfnt_off00026b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B85 19500 bytes
SHA-256: ec4d26c209e6c859e02eda6714f37c83f3f582fcc0054644142e6ff61cfd6cfa