Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c967fe7ea916e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a97b383069a89f04a171ab161610e971 SHA-1: 043908959c96119be53b0eb0a2beda65c0609f4a SHA-256: ab1c967fe7ea916ee2248f8013b6b61cffb6671a2c43c378beeaf2a943b9b28a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The link farm structure suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/023a3842c7f154a8b62f70a7025be293/mekow.pdf In PDF document text
    • https://etonbio.com/newsLetters/images/file/20890560180.pdfIn PDF document text
    • https://ptogel2.com/contents//files/1323987126.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968a3f43492---14054789520.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/itcp3guvor1r4fjff80reo5jgt/89921018374.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1781c0e801fd8f1f5b9905991838a1de/fosamowamakofitadafe.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210819_9C621B3DBCF5CB7B.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb49070560---kulovelinupifusi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b3ade6b7---kiladurix.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vebafupizam.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/89319885754.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/vusewojipufo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038fe93235---33183426935.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4p930ndc5eauujnir0epcpk0nh/fudamez.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/jokewibupomesedusitub.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a5d9f290---nugerapo.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/23578908691.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/zuwajimubimig.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/timinewajetupebi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vhadqjtkj2nib7iiarilmtk7e1/xojobenazu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/35247403192.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/99289760112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=general+electric+spectra+oven+manualPDF 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10740 bytes
SHA-256: ee50f1dd0e8603d168087138d497edd15d5769dd7c3a619e015440a456b61543
font_02_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 16340 bytes
SHA-256: eb5a7fa1accacd27483745b3a82ac8851c9f2192e793545a5c0b35d80132a404

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