Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cec8523e52cfce…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 20:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9007918f85e3d3e899865bfebdf24691 SHA-1: fbbd2919adf0e07941a186af84bbbadf27ae1a42 SHA-256: 21cec8523e52cfce4a06807f43d8f43e37ebca3fae17d5577343cbc73533d9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to compromised websites, many of which host further PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://coretry.ru/uplcv?utm_term=on+the+subway+sharon+olds PDF link annotation
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b4d3584199b3a07e95b26294c13f1068/piniwizonapetolupuraro.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fukedametobinuniba.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e15cfb08c0ef0ffcf17fad935b7a06cf/14420274663.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f62d91942---dobol.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd36a7b5a---69576701660.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fc2efaca7e08f7819aa062fc28b1bb9e/20561252570.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sukobalagake.pdfIn PDF document text
    • http://cichanski.com/Upload/file/basetafuvobupu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/62e7461decf5d2062eb7e1aa25ebb339/92779136312.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa7c5468e---33809993168.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37951188482.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/80e92fc7f7a3048c95fb83c99ee711dc/19501757280.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/julunuxefome.pdfIn PDF document text
    • http://panteres.com/files/files/sodenefofefus.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e079a9a3af9---bigetuzupupulerizis.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607802dae4ee4---paforopubazedeweras.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d261c492a340c2bd429c8dd1073ac83/24554078195.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e4600e91---189653588.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/1372211438.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/4202070419.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xatasurumeji.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87068124742.pdfIn PDF document text
    • https://seerupit.dk/assens/file/40958494706.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/25782381733.pdfIn PDF document text
    • http://innotack.com/userfiles/files/natajijomokunatud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608591874211a---gakazirupan.pdfIn PDF document text
    • 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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10716 bytes
SHA-256: 261fb38edac4860310aa6aa86b4e7226c7d3e7493bd55a6c5d28b889874d39a4
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17044 bytes
SHA-256: 89dbe57d247f8d3defbba26c43238c97468ae915066ffcf258e55ce71e4ae8c3
font_02_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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