Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d96a659cb983685…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 02:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56f680b19dd5454bbe25aebcfa3b0a9e SHA-1: 9edbcdee5de08e240a7a53cfae72647e9667f21a SHA-256: 9d96a659cb983685ed321e2f225102ee3e17d0f5c7deeacc008d45a3b78745c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://hohsingfiber.com/ufiles/files/28748007680.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/52213303715.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142c71044c85---1232854403.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/52944496712.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/romubifagakibediz.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/18328877592.pdfIn PDF document text
    • http://deauville.ru/files/file/vojegaguvusaru.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33c0a3eb6eeae8c068f11558a751d7bd/kusanuki.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/pagifaxutiz.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/gogeba.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/29876141124.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8a3ae7147881c695a20a7eca0229a426/43580023459.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/68866487522.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4b116c2e099cd36c048014be6dba94d3/33215523999.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/57464716213.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8b5nbddekfr2i2gkognqt06s4j/2422185223.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fasubuxupifafifugegu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/mitoje.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/43288192606.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/49010031276.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/22102443456.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/jilivojufif.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/48ba5634b889d834ab2242b24199f47d/31120661512.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/25877181995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=when+did+the+new+walking+dead+startPDF 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 10580 bytes
SHA-256: 003792f46e5e741fbcbb522e7fe10079f61e51beecfc11ef641626580cf134ee
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 19180 bytes
SHA-256: 14867432a5691598a9a9df548a3f1faf66d20b46aab216ad45a44fd3ae2883f2

Open this report in the interactive analyzer, or submit your own file for analysis.