Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5624d0f1cc7d228…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 17:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bb8a6b3c695d8ba4c06f994040855ee SHA-1: 2bb775731152c4a614f96644af21c3771a1ff2c1 SHA-256: e5624d0f1cc7d2288b8ae7417fd5fcbcfec8ae0683a15bf8e83e8700666b2db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71723133574.pdf In PDF document text
    • http://merklink.nl/site/data/ws/files/86296351861.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba9e3a71237079725715516de9e008b9/7593638276.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c603275287---bufodolezatatogej.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0e3ac7fe46563c0e11e7151c9fe37cbc/witenejutudamako.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zefedebubusir.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/14698151823.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/momumemawisopoguxadik.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e389ea315---wokulukokiwibiwirunozepe.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/87216025604.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/96133453778.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/41368212910.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/68437357552.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/wifafosawedamubipi.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/91777342684.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/9280120696.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/35744101782.pdfIn PDF document text
    • http://cwesp.biz/upload/file/44020383060.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xemerezini.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/2542579397.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/17761721171.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42f406303---jaselipavuloxavatesito.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/255545594.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_54202A8A568B2AD5.pdfIn PDF document text
    • https://kaparatt.com/images/File/lomavobilumosojamazamibo.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/kixifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=primestreams+channel+listPDF 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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10376 bytes
SHA-256: e72e85333d275062caa03f6d1343cf114ebd3763e12593d3bdfa5f1326bee473
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 18244 bytes
SHA-256: 64f0bac71be2a146f156181c0332fa538627ce039da624919d59a2f7c6161d7f