Malicious PDF — malware analysis report

Static analysis result for SHA-256 480c6e79123f2e9e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 20:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5193918d4ae3b5af3bd7ee0b023c9aa4 SHA-1: cb0ccec6e1d0863518334fbaebc0379e4e85822c SHA-256: 480c6e79123f2e9e8d634d6b22f48fdf6ef5ef83040a2448b978fe26dddf56cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically related to phishing. The document's structure as a link farm suggests an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac09597de0---37543041072.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/23286629172.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/guguminanow.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/60554932130.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088b30c920c7---47252356285.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb8420ec---xiximefam.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/65593f34497ed0b064e2c358ddee4964/89168938342.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/70783670211.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e02c8e99d92---44770751196.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca93942e0c---zikivijilagixudofexati.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/88654627355.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/pugubesukaziriromon.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210629163218222068503.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8d8c214315e9de39885e433e1de30c1d/30823561885.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ece5skrcstv7hppvggh4h4ve7q/batojagodupumodenez.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jopumurofonosoje.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/30050065172.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kolixugewedujagujewotef.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibugu765s2u8764087903u36ld/pafajipukuxenoli.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zujobub.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1e67cf266---96169263915.pdfIn PDF document text
    • http://360mart.net/uploads/files/mujudipagopelinetupo.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/17268920770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+grammar+basics+book+pdfPDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 17376 bytes
SHA-256: 1a39a6c0fd3bf6a9f2be45d4c8985f5d11189d7df568e514b5a8b3f7a6ef4f46
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 11052 bytes
SHA-256: 6db3d4d2debeeaf3abb7eb751d0241624106707ccbccab84c8b54a3cbf9c4c1a
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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