Malicious PDF — malware analysis report

Static analysis result for SHA-256 573ee9989c8f861a…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 01:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f78a02c79ed31824992d6dee173ca93 SHA-1: 6a6825e8881cb3b17296cc292d1f2fc59c3f5c64 SHA-256: 573ee9989c8f861a790f01187a60c452e7d8d5161606adc9cb9ed799f2301b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to external sites for potential exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=as+good+as+new+synonym PDF link annotation
    • https://aduanaldelvalle.com/userfiles/file/gotatupenakekajuzegukike.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/26166978353.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3744efa2b6d4253a8c3f5f3b668b7779/gatezop.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vosigurakuzuxesovek.pdfIn PDF document text
    • http://asustainable.com/global/file/pevaxizuvobefi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83138b0aef---78323996054.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eb9b96f7b33b83dc8141618bc4d215db/17231944746.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/q2u2mjq400878b6a8e2meo8aul/74240394783.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/luvaruxapoxujezo.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zofizoxibomonisoxujudase.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcc0afdce---28658767045.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///17335509230.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/woruwijuzipanewa.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/94c8c58ecd16ff58af513621c36e98e6/55238371962.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/83451298023.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zumavonisuvumegovetow.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae34c017dc---68965970526.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4a1525d23---88630571908.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/49460110955.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45f024458fcc0ed9f0a0786221a5265c/zesiliz.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aog3od4eqfqchmmfuf65t4negq/34028322307.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/20948648fcadc365101c706834cb0064/60187326794.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d11fb1785468097e75207d33432f4d71/tibelifinovetipavovinu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/71981551227.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1130cf3cc7---zosekodojomi.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 10436 bytes
SHA-256: 8fe52d13fb6cdf3c1d486d89a42c868010d09c0e4c6bea886d8d0180112acd36
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 17820 bytes
SHA-256: 91f7fb2b758995467864cb91be5ee5833802d61e725f98586242ffed89c570a8
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1