Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd89799df452166a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-22 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec905d07ea7ee151307a586182f88066 SHA-1: 8674b4f6eea0f5bdf04c396ad9044aaf25c09938 SHA-256: bd89799df452166ac205c29475e85ab6459ae6d9c261146d1a71e049598ebb2b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, potentially for phishing or malware distribution, under the guise of content like movie streaming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=blade+runner+2049+full+movie+stream PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/sol1cmfusggjtp8f6498tsdcv8/26828533671.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/60063647871.pdfIn PDF document text
    • http://esteel.my/userfiles/file/gazuregesuletadutup.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7b3j5trsro33mk83hahdbcinug/29463066225.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekenik.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jafokuler.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/dorekuzifapikodedif.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff69a0519d---88275641598.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gegemagobabewezunatevufe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae8eb56d4---jujazolekuvofef.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/92785096703.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/89130434751.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/84004318331.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/vidomo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jalotite.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/4020664507.pdfIn PDF document text
    • http://planbmedia.hu/files/koxisema.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/megej.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/busiko.pdfIn PDF document text
    • https://baglab.pl/galeria/file/45114826150.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/30343426089.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/65623442492.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 11220 bytes
SHA-256: 3eabc3c77d9730bf5bfdb3911a8a6269c36b87a91f2596e14d642d26a8dc8fb2
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 17972 bytes
SHA-256: ff3584fc2bef2bb6d31b37823a6a3a87053cc3274027d6c0cf27759b472daa45