Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156b74c8030b4b7…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 13:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90ad47bd0d3b0fba8805e4ae1c28e3a5 SHA-1: 089056aad2e844edb611146411e3e5a3e27de921 SHA-256: a156b74c8030b4b7f2a587440fdf4d5bfc007b57c3af4eeb61f96487a0c03f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=computer+se+related+full+form+pdf PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/te2k349d6aq8mr9b7dr62aedd2/51178641471.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609082413c444---80635902851.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/78014513298.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/winigamimarezadulimebe.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210602193643169.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/33984363735.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab161dc61d1---podezuxipoxijalolinodewes.pdfIn PDF document text
    • http://regcureguide.com/files/files/61554342970.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xopimilurinuranojep.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/68520535963.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/35196199704.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/76738234293.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/zumowubavapebenatilafifi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaf46dcdc---44735339139.pdfIn PDF document text
    • http://keitbg.com/images/files/muberaxoroxepawomokis.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fcdab54---zejedegodegivamulinaz.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/monodexe.pdfIn PDF document text
    • http://crm333.com/documentos/file/52501753774.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd940c8792b---zetiwimojotox.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///202181983302580.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/53805011644.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/wigebodojis.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zogona.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/badepemujibepesolavivo.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 19468 bytes
SHA-256: ac0717dc7e4b5e654d5885e7d1076f44a34d29a12353edc4d0a4111ea2c354d8
font_01_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 10592 bytes
SHA-256: c7c16f79f9a082d4a16e48a7a6d53b70ce6166d121a6b59b248d592cef368ea3
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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