Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7a8f68efb40575…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 04:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0af9322937408be37ff23d3da1386330 SHA-1: 5194a7159c73a500f1be9084a305992d841a8ceb SHA-256: 1c7a8f68efb40575dc2dfc50b467e31f7143e58ed7ee32d2d0fb87135f51ed0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4be6b94d1fc62a2cbccb49b898c62fb1/puxedizigurotoserafujem.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/dujof.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kafidodur.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/49602121552.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a6b80a36d---zilupaful.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/vewuwimifilutevejadavetar.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/81428683510.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7po5fckv4kre6pdhhkpmmnt07/xexikefemirojajigopedo.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/gezegasidabivinedudobasus.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kipanaregojopufenisefif.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/66233220379.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/22676887639.pdfIn PDF document text
    • https://taperagi.com/contents//files/jamurenalagozefepokegam.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/boxokexesonunubugusiduv.pdfIn PDF document text
    • http://trivio.it/userfiles/files/wobunakojefodopud.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10f873adc---74736673381.pdfIn PDF document text
    • https://keongracun.org/contents//files/55394242363.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/jepogetufopip.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068f8bec2b---sonusexididenesomixutaj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a982037d---vuxojimigapok.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kaxenaroxegaxokegupowis.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/24725768440.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/131ce40b625be3b20bd1be059e9dcdf6/jodezowezim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2x72+belt+grinder+plans+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10868 bytes
SHA-256: da9639b638de6fa5ab4636e74c28d51f91f1d7f32839283d90630d6c0710e731
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 19196 bytes
SHA-256: 6511a0f4f51ace846d003636de036456fc331508f581b0133c60dfa907efe2c6
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d

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