Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ee824d6f98343c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 06:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c7aa7f9e47d301640365fb1ca3428ce SHA-1: 5d27918f52149a1dbffa930491a429ad29079617 SHA-256: a7ee824d6f98343c3d0ef8c8063dd7be41133147f9f3bf68a683363e86e4cf1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a focus on directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tcgardening.com/userfiles/file/2021090718202873499.pdf In PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93688275736.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/12683813525.pdfIn PDF document text
    • http://citty.org/images/uploads/file/67955038764.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oo9aqca4429kc9rhaj1vtn6r70/95352794790.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/89269829586.pdfIn PDF document text
    • http://pasaru.com/upload/files/jomovofulofoboninageruwab.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/gerufarawimawozunoxor.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/81490672442.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/78378962263.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/giletazimojolomowewane.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/23872251861.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/detipiwexoxur.pdfIn PDF document text
    • http://aurora-c.jp/files/files/43210452539.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/70655149692.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450802a19b5---91592912367.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613deee612454---zutaweloxozife.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/memanivi.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/35415565827.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/706230a92da3074ee0d8dd77ec99df72/50678344083.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/15167709188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=trasferire+messaggi+whatsapp+da+iphone+ad+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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 18796 bytes
SHA-256: 2e58e4351fb62a558c18cb3a127561c7fe3ca4be631de4241c26046d936266b2
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 10948 bytes
SHA-256: 1f6a92bdb7e9c04169906e77dabf35ab5476a53d9a677af6d061e8ed93992747