Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac4c4d75964ab23…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 20:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01c63e34074ff5fa43f96a33261c685d SHA-1: f57a5538dcdc1f97f2c038b18119dc6a163ba63f SHA-256: fac4c4d75964ab234d0c7a9ae68ac3ebf217f136f9557b466bcdb9bf40d6df83
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=fear+of+public+speaking+questionnaire+pdf PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df462ca52---50237978220.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a47fc2825---71039984934.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adc2276cf51cef63fc5c6c44eeddd394/7854089088.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee317ffd---24043906395.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/dijitu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16123bdd5cce93---radazeduralodaduwimopileb.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160765f3b18e02---mikokorinenej.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/91663284937.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0d75c9b3694cd1c208ff76bc946ca4e9/40826199114.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a0phleredohii8nvli69rs41eb/varowigefetewigivivepowu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7beb6305a7---44984566408.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609460fd8b9bd---sazuxonuw.pdfIn PDF document text
    • http://simonide.org/userfiles/file/34497701948.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/baripujo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/23375278291.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905085501.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f542c401---jajuno.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/lifeg.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/eduts09e35fdorts7e0pt7r3p0/diwenewaj.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/36613157909.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/joxireva.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31a519afd---43447382075.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tokidiluxoxudakebe.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/9716020496.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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 11248 bytes
SHA-256: 134edf80aa2fb56571b5b014f19e635c7e7091908d2cc93ed26dd132e8cebbc3
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 17600 bytes
SHA-256: 9d5b7ab724a4f04bc158a2f76e4ad9974f8b14834400ceb78d85498f1a0a463b
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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