Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bee801e9a0c201…

MALICIOUS

PDF

94.3 KB Created: 2021-08-18 20:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3193d2f5f94366ddfd0183d8dbf10079 SHA-1: 3539500b05a16414f2b32cd90581e9a0893b3675 SHA-256: 97bee801e9a0c2016bbe69fffceb15a68dbf2c0cbd5454027d72e2ef7c8829fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, some of which host further PDF files. This suggests a phishing or malware distribution scheme, where the initial PDF serves as a lure to lead users to malicious content hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://kermoulin.com/userfiles/file/zelowokosa.pdf In PDF document text
    • https://yukkumpulgroup2.com/contents//files/69333713505.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7405b0123c---3043338768.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nasutunireriji.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wupajulufod.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/24105199393.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/29073130340.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16108a14d9557b---34273168533.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9b678f30---fojedovofijavakibidimarer.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/61142190082.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f686ed76e2---tufarubefanojexalivig.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c722cbcc0e0155a3bce76381589f8e91/ximuwavonutokek.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/68869968280.pdfIn PDF document text
    • https://businesslife.com/content/file/fupitasavi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/7580193640.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/dadakifid.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18d671f43---21608195734.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769c7adebd---59139408827.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39e494fbcc---zulemasinuzo.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/487838998b85971588e51159bc56ecb3/gelavewikumuzomedave.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/97354838156.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/64376932953.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d24d3932e---biludizalogidin.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f48d9281---83553416804.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/salizomunosopif.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78b5080b66f4ff54de22b9d797db0104/kafisizibedagomodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=%C3%A9l+estaba+in+spanishPDF 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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 10268 bytes
SHA-256: bf56d60d9d82fac98578ba8a7d44fd123aae5a15563efe55f1b8390bda18d0ec
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_03_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 18272 bytes
SHA-256: 02bfd5769a549d3ffc7da5b1bae1659a6685f5fd0299fc6b3bc50b9cdd1b3565

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