Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb642ac1229bd0b5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 15:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edab23e4b94098b8f506b2a21260145a SHA-1: 2f3fd317f7908972efdce0b38031fddc9d3486f0 SHA-256: bb642ac1229bd0b51432d1563d51f78bb333eafd0d0dd8a1f178c380ed14b9de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=blade+runner+2049+watch+online+123movies PDF link annotation
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/1353235403.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/14233368905.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/limowezizomemazodulazavon.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/ninoxabejisutinijesanuwo.pdfIn PDF document text
    • https://2acontractor.it/images/file/loferelepa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c2936017---64130059547.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/86348622593.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146640f55298---64742090017.pdfIn PDF document text
    • https://tarsiman.ee/files/file/52776806736.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/88745598147.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1hq447s4mtckq33a5a5j91pv82/81288134372.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/84373283286.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/tuxukipe.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/29758635797.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20b704722---mafamusuwevovidu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420be1d23ff---48517430230.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/69932735306.pdfIn PDF document text
    • http://alkanboya.com/files/file///jopatomevumeloguvidegi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mikumurob.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bb2e259c---68960820697.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pusafidafimefak.pdfIn PDF document text
    • http://szcftz.com/upload/xefusotuliribumitasojimo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109190434057799.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuwovimebifepilibomafafip.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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11652 bytes
SHA-256: fa0f3fb04cfda8b0b9ee92b3495a7e1857f86fc067456cbc67d307aaa704b504
font_02_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 18264 bytes
SHA-256: e92bfd1f840ecb651888d892297b7aeb0510277bdb4ccd1d45a3f01bf6f37c14