Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d7bbc90e01bc9f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 14:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 977f42727e5d2d26889daf4b73de18e9 SHA-1: 912b2788bbd3d70975f549f5c1f153462d827994 SHA-256: 97d7bbc90e01bc9f6d609d49cef4201d97617f62f643c70c508fc3742050f975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to numerous external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://skpizzasubs.com/uploads/files/90426314515.pdf In PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/11152858615.pdfIn PDF document text
    • https://angkalaris.com/contents/files/vebigupomepuveta.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9b127e6242b175d9cf3255af8587d99c/58197300781.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fmi52aurjonhvi55ikv69nd4kf/godijadufojapoparidilavi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/31961915858.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/matululovorepegid.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73229dad---pijutuxade.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/naniremokonivogari.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/bujefitukavowekoken.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0558068a2ba04cb109990d36c6c946a8/88510344961.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f54ae5dce---janat.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/gogorer.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109081501581449.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/gapiwerazojakodapama.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231507202708.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/94310045425.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/fewakogasaxasekanegevare.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/84091979393.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/75820663999.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f904dfbc---80200270318.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/774330181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=emoji+not+showing+up+in+texts+androidPDF 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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 14576 bytes
SHA-256: 36811ecc19d803f57a922f5a9632433f1a2eb7217c3d484216216c967a8cf23f
font_02_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 11196 bytes
SHA-256: 2851589faf0d384cb8df215c7c2fdd5cf057eddc75a37b3c3ea7a2372be19951

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