Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4acd042b9c524c…

MALICIOUS

PDF

110.6 KB Created: 2021-07-06 11:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 23bf65076b949ef0f1d93693e5b8bb0c SHA-1: 4cfeeda8e375d812235acb470e99de3cf04598da SHA-256: 9e4acd042b9c524c94b572548d2d2bfb8eb45e34f090a42a9fbe80258fa2f33d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d663616---bamakodafowazosev.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d66accd4---5322078337.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbc873470---kepukoxejepu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ea0679f2---purugivixirado.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/48544893860.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/zizoketinu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bifimabimefijuxabofune.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/14d46c96f16770351fd46818a8fcea91/96622098218.pdfIn PDF document text
    • http://ranagro.com/files/89315780403.pdfIn PDF document text
    • http://iccarrentals.com/files/file/22444984913.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo6bkfucuke23qkr7hjshk0o2g/zetiture.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083eb362e862---kasodigoresozobuti.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/tiqj7euftlhdtcq0va87ov3ged/36500399708.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/504aa0c4ff67adf1a15329f49bc0e772/61170797021.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801e1aa4ea---63212264818.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777afac7a20---18306586878.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8373242a66---63091907254.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6720c88c17---radejanafawizinubirimuz.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ee72726af366379361de5cb52281f257/jimawirewevaruladoma.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/92070274802.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/23826562330.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/7n648l1iovme566ano2i3474b4/18383812874.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68371be86---gukewesalav.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/33249904499.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c71525c6933---fusakorenejexunoxolo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0j4n50lc5lnn9bjgrhctlvokj2/riwosidagesojiviza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=10th+old+bookPDF 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_off00015268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15268 17288 bytes
SHA-256: 148e8af8f0193032657f4fb1ecf5de90f0d744e16cef19b8fac3d4edf379fef7
font_01_sfnt_off00017f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19788 9896 bytes
SHA-256: 634bab5d170b6365c1480d96fbbf0b83b05dea2c30acddf94df7eedb691380e2