Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c78af33e4f7549…

MALICIOUS

PDF

88.5 KB Created: 2021-10-05 11:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 568240091def380ec77d0dd8e864549e SHA-1: 9dc0915304bbf4f8cdedb8b0edab2a9779d037b1 SHA-256: 80c78af33e4f7549f1065c25d096dff0c17507d15987cbabf5c2e6b94076ab97
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=love+and+encouragement+message+for+her PDF link annotation
    • http://bowlingkillers.com/imgdb/files/vuselokelozugavolupevore.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rbcid1nk3u6i1qfemlefin2uvt/62840117781.pdfIn PDF document text
    • http://ccsl.asia/files/89018320342.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/82945485195.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/58622538721.pdfIn PDF document text
    • http://1carl.com/userfiles/file/pidutejumezexobonabaserix.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/85202735381.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nimolufawujakutox.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/70540110550.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7eb9f7840280ce73124cf0bfda96b6e/47854481823.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/4343820082.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/denita.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/30858825121.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13974906070.pdfIn PDF document text
    • http://tradotel-riviera.com/file/27960631030.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4687682e58fd583dcd63b1182db058c6/kidimofu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc8503b77---47170084589.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/ditisizelopebel.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/22721004345.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/dagenupemutixonoruk.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/35847447825.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210913083648.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/ripefafipitow.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wijepuzifilinagora.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/7188782336.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24818345048.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/13668938336.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/464107b6d5ddc743ab5e2b1fc694f998/zozaraxexolum.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 18624 bytes
SHA-256: 332c45f6a28bfdf844f051baf43cfca571d7914bcf9937b259ac47be7a6ab79e
font_01_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 10908 bytes
SHA-256: 6bc07cdfdd93c4f3dcb9efd8778bad27524da05af783061111894e20ed06027e

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