Malicious PDF — malware analysis report

Static analysis result for SHA-256 f604d9ffcd8a6849…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 06:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a559e9b590a7be200ac218c5e584a6b9 SHA-1: bcbe3a971e17fc66f02fb2d465c38c6786b3d3cf SHA-256: f604d9ffcd8a68495c45b74b0b483d8bd1b13f6fcf7aabf3c9fe34572bea7e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that employs a link farm technique, directing users to various PDF files hosted on potentially compromised websites. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to deceive users into downloading a malicious file, likely by impersonating an invoice or payment request. While no scripts were directly extracted, the presence of numerous embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aktifithalat.com/resimlerfiles/21992380484.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5ea00d71---42114100840.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wawibexun.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/81008254570.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bc819dda---latizomamaxidonejezapeso.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/legipunam.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952ff78204f---xipivofa.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/47227957039.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/92265559331.pdfIn PDF document text
    • https://avenue102.com/uploads/file/tudijan.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ab3047a7d5f3164cb76611b3b6838a6d/50795233186.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mivasafizaxu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4efc4a93---denanakigabavumiv.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/sifigatotuzusimolak.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073740c87d3f---firekemivavisis.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/43736471263.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/75436998726.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913b88a5f37---21207386730.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kifup.pdfIn PDF document text
    • https://securitydm.com/slicice/file/87310793475.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/27237593380.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d10cc590b---rosodorefosufi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pinixemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=houses+for+sale+in+bettsville+ohioPDF 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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 17268 bytes
SHA-256: 91daf55c022e237ec73a83125be1b3a1b4247fe29a2e0c61cdb884c39ab22093
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10608 bytes
SHA-256: 9c68f8da50b4369ef7d6aa4f95790e3bc732d6191068e018bf18c781a53a3a94
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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