Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63ce392354db358…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 11:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a4186ba1257b461f24a0d9915a336c9 SHA-1: fb8917e3855b0f6688c1b3e3960d07fbad76e10a SHA-256: b63ce392354db35866d60a05b603ccdfd9dc109582fc23e1a5d49e3636d92f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://eortak.com/img/fck_temp/file/loxifixilurulezodonas.pdf In PDF document text
    • http://adhdesign.de/userContent/files/20210907093754-govelewebumo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/6267944439.pdfIn PDF document text
    • https://edusfera.pl/upload/file/46103136011.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suvezodezugedol.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/398b3a2b788756c048bf3396b7faeade/74231026739.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/44228138346.pdfIn PDF document text
    • http://frchem.cn/upload/files/xonaxa.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/29163802969.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/giketugerezexivobar.pdfIn PDF document text
    • https://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bd07452452cecc1af3c043e696e95cb4/66154073681.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/kejevagojemunesufa.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/lukuvawakagukebexizoduki.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78590937575.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf0959b3c---kapetunarasopevetagenuvap.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dakezuno.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/73674733321.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxudupipunimevovejidel.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dabfe55d9---bibulosaxurapatanemob.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/gopozuleraleluzu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nenajajefev.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tonufe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a52c227---63041192628.pdfIn PDF document text
    • https://davaocarrental.com/images/file/14650503517.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/59705966028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=add+company+email+to+androidPDF 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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10604 bytes
SHA-256: 3e5f89e77110e2dd87edff9bc67061005002d0f8782c65d02fce85cc52002243
font_02_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 17460 bytes
SHA-256: 57abc56fd7b66f1ecca6b0fc19a9ea4047271b85431d54feb3341eecb07c87f2