Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d729009593209…

MALICIOUS

PDF

84.6 KB Created: 2021-07-15 14:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ef7887454c5b4494c7c604c88e30678 SHA-1: a1235f94bb4628516372e3fb13836e2fd9af7193 SHA-256: 5f3d7290095932098f672f66972adf5808c56223e536b7563e248c08367a412c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22215308e5---mikuvis.pdf In PDF document text
    • http://www.polni.si/Images/files/nanavi.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210709054201467540oegb5.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070504562910.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/46812997518.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7508cbe117---23474920327.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/xijerugunatelu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457eb903c4---22120586052.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f7a66f54---zolel.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42da378ae7---1237813423.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/22310460734.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/76775086087.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/495d5d2d9c1980748398de9e4e3ea0f8/47758821419.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087285fa6d64---76058279429.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/jotexesojabaxivodotog.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9e6420d66842455a32937e192828fa8c/vefogave.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608356ac937b8---65039453059.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087527d25d7c---2641885761.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608df3cc2286e---pelumozelugimixesorasikul.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/20088436723.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/108do8i67oj65ea17v2kbivart/rorokavutuvelok.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/devoxefoxu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xafimekufos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+function+graph+in+excelPDF 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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 17344 bytes
SHA-256: 768777a06723d1271edc456ec0318ba9a4b586eece12d66b1623e5f960d5b8ee
font_01_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 11128 bytes
SHA-256: 60f714109079ac679c4fa73e6487540e945dacf796e4d65b4706c0f32afb6256
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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