Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5532d900c13bc…

MALICIOUS

PDF

100.7 KB Created: 2021-09-15 12:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e325148f2977f0e46b40f8989d0d49d SHA-1: e3a81d5e3ebd9e21ea38f6ed58361cb8352989e5 SHA-256: fad5532d900c13bc0b16bb24afd7a9c06e0a5b7df14082de90a041b55cd4a93c
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 websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the use of link farms on potentially untrustworthy hosting. No scripts were extracted from this sample.

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 https://pistant.ru/uplcv?utm_term=open+source+sip+client+for+android PDF link annotation
    • http://cedule-plachty.cz/files/file/rezifikakada.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/51668642778.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ntedpjku0ijhjfrgdr1nq23q30/xiwibiguz.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/sepotugixapovuximukobe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bocccui0vkc3dmv0ifpdtqdop2/60991142262.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/movazozekebojuwajibu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/juxosuluxezogi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6873c8de3---zewaninamixibuvesa.pdfIn PDF document text
    • http://weingut-suppan.at/files/23509122695.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/86130498443.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/sivulukodiwevavol.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/tetarepusogibixasol.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tudupetob.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/xiginub.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90322527033.pdfIn PDF document text
    • http://chenruichem.com/upload/files/67814243711.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/66663785165.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/18072013982.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/95754964136.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kuzires.pdfIn PDF document text
    • http://prmakeup.com/Image/files/rototovevojolokosudifevu.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/bexobirugupijip.pdfIn PDF document text
    • https://rubfila.in/files/file/53122765122.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_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10736 bytes
SHA-256: 2cea28072f74eeb024f7871ddb065a5e6ab8bfea39d6d5418deaa2a74a59e31e
font_01_sfnt_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 20348 bytes
SHA-256: 8885e0e8d0e6fda4d9724d3e6517ee9595022cf5be294c861a31174511de72d6
font_02_sfnt_off00016cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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