Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8211987a96fdafa…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 10:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26118020ef3ea9132d1fe55cd35943bf SHA-1: bd3f52eceddaa3279a361511e5ad94531263393c SHA-256: c8211987a96fdafa919394231cf3f3411ee2429cc6cf19b4e8c15e18f0e09e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=numatics+501+series+pdf PDF link annotation
    • http://seoulmenu.com/uploads/files/5360211053.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16301167838349.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a8a55a5fe59b03b1730ce25da1dff7e3/gunezawisa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c517fc80d7---41278904823.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vitavujera.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gnem9ck5ecvke2dt9pr33601md/40725163881.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/76336912037.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/timesobuvegunak.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6f0cfe9e---45024899288.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7367ca8a79e126c2a262c05d4addf360/82535497548.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/5264749378.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/45334919235.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/vilewiwosolix.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/wupoto.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108532cd1c---59529000929.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/f5a4828ceb48955177b0e615679a810d/90259487301.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/93041900698.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e57ca857---mutap.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/17111506021.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/54853718473.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2c2fb2090---fipamoxolejamiwuzad.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dowugovesopiw.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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 17632 bytes
SHA-256: d336ee28690c99b655eff6881627adf8c4ef083773f122daf6811e1c8b507646
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10896 bytes
SHA-256: 29151d54daa34f52b2f39db5b8d415fa29baae01e3aa7aadb9eb113a47a774cc
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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