Malicious PDF — malware analysis report

Static analysis result for SHA-256 593733b8da22d8b7…

MALICIOUS

PDF

75.2 KB Created: 2021-08-30 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 98b9a6a41ebfb702c29bc189c891822a SHA-1: c47bfef2a84478fcc00cb28948fda45d8424cbe9 SHA-256: 593733b8da22d8b7c4d28c72a780a7d48bb466da634da2548a5493a507f98918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, with many links pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=convert+pdf+to+word+document+for+editing PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/20266708680.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/pufowugisubemix.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/notajezisagudelivutas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84bf00b6f849d0850203d727611de55d/68327279805.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/xefupe.pdfIn PDF document text
    • https://btegypt.com/file/julanenoxutitewilogudo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/givigazepaxanozezowito.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/33f65fd542a5baf949ab1324eab235ca/koroxexi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d93e592d0---fafumupigivomezukafek.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9bfe4145---numosotoxuruvijiwawib.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/pukatagaloka.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2578c7ab9---29194295329.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f3552d7e908---lerelegagoxaj.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pumaxinevoxozowofapuso.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/89241522406.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070205084470554.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/d35880cf6d2bc09084d316156de802d1/42634567301.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zegejasomer.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609728377649a---67810587523.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9c038cc4---budugatixovejapus.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/96274923433.pdfIn PDF document text
    • http://minerva-collection.net/files/files/sufimaxijoroluwanope.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gidugamuvuwaxuvupofoxuv.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb4326a021---kututugofesuguferipo.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_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 16052 bytes
SHA-256: 6a05d8dcd86887d135134997eacdfb3831f0a7dd6098254d72a3e462076e6e98
font_01_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10872 bytes
SHA-256: 72697ac726b9da64a6e1e83d8c37bd4dd6faa528c66cd8ddc3f6f89a4dc240f6
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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