Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb7ea88695f7093…

MALICIOUS

PDF

79.3 KB Created: 2021-07-29 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e5286b91328728665e80af10ecbde71a SHA-1: 02a8644d3bf935ff708d7050cbb6052f24bd811e SHA-256: cfb7ea88695f70930b64cf8073d5fdfd2cda8857815d2039fafc5cb3ad11c706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5501f3383c930d2e7bdcdfc01a762217/91787479257.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d1137d19f15e5153b8fc46fddbbd2d95/rexefonujezulipofafaror.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160da8cf0c88ae---doxepakoxolomewogune.pdfIn PDF document text
    • http://wjcopy.com/upload/files/69988480921.pdfIn PDF document text
    • http://lawngo.net/fckfiles/venejagosa.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086eed0e82d4---3403216214.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/busut.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/24976885664.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e702c4e5961---zolirupevofojopijofarepi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/99211998086.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/m8suc4j8u0nel8b429sn62pikn/16538782254.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9126nmj9n4h51egsh3s6uv1jt9/kagijeworetobadadesoz.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/45423729078.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/sjg8uf98pigpr0e9k2dfmjq20e/69585926376.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1sltvjeu7hd7lcu92ftiphb2l7/15694547158.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc535f3f5d2---88129100681.pdfIn PDF document text
    • http://amandamaitland.com/images/file/14238329180.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/58205330682.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/17080795969.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/luvezelefivo.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/susaxuwekenirusodazazas.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/32420c9814e8751540e25c84f0afb80e/79770654391.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7c0cd94---83565110337.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609117eb71910---nimokunijajere.pdfIn PDF document text
    • http://atomleasing.ru/media/File/8520425474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=barron%27s+new+sat+math+workbook+pdfPDF 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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 16812 bytes
SHA-256: 347f5d64fa8c411c9b18e6b918dbac6c19c6e7c33ab4148966fe320d81f99319
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 11028 bytes
SHA-256: 622f350dfd95d0d2173edf9335735fa0754a4d22c6f26907917eb88dc3b2c775