Malicious PDF — malware analysis report

Static analysis result for SHA-256 103ced891c3a50b2…

MALICIOUS

PDF

97.3 KB Created: 2021-09-18 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 667667d7e33c6a81bc7f4270cce47079 SHA-1: a5775f09c1a614e6c79ee8ae1348984061d43525 SHA-256: 103ced891c3a50b2cfdcce1d8ef928f84ba61d10b3591b73963e027bcc1d052b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://we2meeting.com/ckfinder/userfiles/publics/files/63099240158.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k55g2h4bm4dtakuvp4ar0rg54c/gogiperinavepevogixejid.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/fokuxivavi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b8e870952348d006f4b7161176cfc05b/wibixejalexozuxawige.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/73311726975.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0de3d49e---wukukegurenawasenasebo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b832f7488f---90328839002.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/gesadumojiwudefi.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-17/20210917162412626052.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c33a73f9---7517342727.pdfIn PDF document text
    • http://midospa.com/upload/files/30660137811.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/1911042623.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/29994652980.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/71408292525.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f1fqmt1cg2ht7tqgvjb5hc2ugs/80995001872.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/fodojono.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/307f453058dca860ea50922f0c8ee610/525080530.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/4617018239.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913141420.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fijewalagojuwudojodas.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/31252597659.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/03c95e6c049044be4b5697e5c572bdae/27999116272.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88982907676.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nigeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=naruto+shippuden+fillers+that+are+worth+watchingPDF 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_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 11064 bytes
SHA-256: 202cd568fdbfbcb02fbb28d0aef58b61572ef69c94e55a5e9fc089b5991a8fbb
font_01_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 19320 bytes
SHA-256: b847edffafdd6eaa61eeb1f29574ec7d64738ec38d8d5c1a310af1a99128376d
font_02_sfnt_off00015f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1