Malicious PDF — malware analysis report

Static analysis result for SHA-256 a071dd8a5e3d9f50…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d94654b6d8eaf1667b314814373b38e SHA-1: fce8045ef50dacf05717192bdadfa3c3128d8d0a SHA-256: a071dd8a5e3d9f50aa68bb6ea69cfd6669313a981e7b930a8c2d24fa1708931a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting an intent to lure users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bushregenerators.net/userfiles/files/19066445636.pdf In PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/5101645715.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/73451f9c0acfcacf3caa04b5caaafc97/74142269187.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kitelomisigexibegituxazeb.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e67240de4e6eaf4efa519b8aaccf0745/divofigevalevawogokatu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/25742452300.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1d6e3abab8181fd43e7c686b620137f/mijorilerunoroviwuxubofez.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b86b4db9---kivafuvivefapirimav.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/74606458549.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gofaxuz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/19411402511.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/18520936868.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kelowak.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/21403640605.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/vitiwitavitisupazufuxugu.pdfIn PDF document text
    • http://alvitraders.com/files/pigakorojajiw.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ragujanexunezitewazoz.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/xerakupe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcc77443d---semeretizibigoworewe.pdfIn PDF document text
    • http://leskovec.eu/files/file/novuroluzip.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063f4c000b---86173722172.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ce64071a---13528423831.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/70551365861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=alfresco+manuale+italiano+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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 18648 bytes
SHA-256: 269906380ae52d42df8b381f5d382932b356ad0a1366c3417774793c1e57429a
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 10864 bytes
SHA-256: 49ee2d0ce622574f1b758397dec398e5da73bebe043c9e6b7dc14aafc4b05a1b

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