Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44897137353c48b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 781de551f15572d589d1d0658467c890 SHA-1: df5aca987978366ffa32dcde5fcfb0fd0e9af907 SHA-256: b44897137353c48b17406f0e37b704f012153890f871624d614f6a0ddbd284a9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=android+emulator+without+opengl PDF link annotation
    • http://araratmebel.ru/img/file/32146156608.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/13d17071c23bf6c83c9e1ddab4b12415/tigirozoturumika.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/satowimo.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lirawonokugukerekew.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88ba9148aba449ef52ce1e90d5a3256/77675880318.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/vewafikirobefu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3015679b.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/70526472105.pdfIn PDF document text
    • http://cartopack.be/Images/file/30218423033.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/19609675090.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/10865682110.pdfIn PDF document text
    • http://hkacca.com/userfiles/40446946231.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tomagajukufap.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/66758625429.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/xokakubunetatosowavej.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a92a5f86e---vufisaz.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/jegapazapezatuwobuk.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/losopivonibaforen.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/8843200739.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/sedomaxudejegumewap.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/xafuselumedezafe.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wogusufatufef.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/metoneze.pdfIn PDF document text
    • 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 17544 bytes
SHA-256: f497c20c7f4100b652e94dba9e314e45208accd4fdd1f286c3c0515b80fee89e
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 10840 bytes
SHA-256: 8343bb1f1a67350bd642c3ddee909719cac8e5857bae4170c9aa524ed78e2468