Malicious PDF — malware analysis report

Static analysis result for SHA-256 9865dcd099ad1588…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 02:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 361eab270c40b76f69d02b16bb8535e1 SHA-1: e3d11747ec121db3134cc0c6b6f32b42df832ce4 SHA-256: 9865dcd099ad1588672b5f58c685af22d3779e4596ee8fbe3c778974bb9c59f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document hosts a link farm pointing to numerous PDF files on various domains, many of which are likely compromised or disposable. This suggests an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://medi-sen.com/files/files/41180680073.pdf In PDF document text
    • http://vinhosnorte.com/images/files/3973050302.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/wekilorotisogunatibakirod.pdfIn PDF document text
    • http://msiutilities.biz/documents/61603869363.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/91308a4788328824f930b89d4ef31b57/podub.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021623127316175.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/4e58c9330504713cb55260628d2261b9/jelugijatulegutoka.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wolopizopit.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/12929627622.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/liremuvoletusatozozure.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/7905564335.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5fe38fc11---goxemuragusetululib.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/guxamafijukuxatopunilonar.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/78535663598.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jhfeu4m1vo0d6fkgbkp48292g5/zigig.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/gadisuvokusavujamikegazas.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///957419947.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210629104905745720b31wa9.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/34964018034.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57a7e49f5---zidegusefalakedo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c56040550---xidepun.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/bknfrqfotq7obdl3rurqbndkgc/77386168912.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/rusubuwisulibavulopi.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed27ed0c8---wazepujaxigemapanatasesut.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/dizupewedidoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stanley+j5c09+jump+starter+manualPDF 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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 17512 bytes
SHA-256: b2a8df295da0e113ca4eade81359b2dcfa65f944175f03046b32fddd468b7090
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 11164 bytes
SHA-256: 7efd50846dcfe56492afbd070436156b6825d1037ed2c16fef8931ba14216f19
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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