Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f91c1ca578d691…

MALICIOUS

PDF

90.7 KB Created: 2021-07-15 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3f0003d540d726cc822e95af01bb6de SHA-1: f9aff1e0352a73c9139d59e236be4680995e94ae SHA-256: c0f91c1ca578d691c1d0d1ede81103daefac71ab46d74ddc4e1de4879cc05859
212 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external links, some pointing to compromised CMS uploads, suggest an attempt to lure the user into disabling security measures and potentially downloading further payloads or engaging in phishing. The document's content, though heavily obfuscated, contains instructions to bypass security software, a critical indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+get+minecraft+windows+10+for+free+without+java PDF link annotation
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f140b3aa327b919e0aa9eae7d695f028/88808468973.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85d5bfb0b---luxexizuwudibil.pdfIn PDF document text
    • https://dineflon.com//files/raxewupujadujewupuj.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/34461161972.pdfIn PDF document text
    • http://apcmagon.com/userfiles/44348858193.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j226664fit9ttupt70milo3rg3/90712613977.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/85052850436.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857aa04539---regetefufakirujabexek.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021541722527534.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f447442f9---91573217299.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/zorifowiviwafoligulage.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de350384048---51277621641.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/jonagexudifotitoxunawurib.pdfIn PDF document text
    • http://abwva.com/uploads/files/lekoganutikes.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/jaleje.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/terobalizi.pdfIn PDF document text
    • https://isosklo.cz./uploads/9235037011.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a497d4e2d6a---3628654454.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gopoxasedupexavenugosoxet.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac843d53b---57149277890.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202158029478443.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/jakigamutusojivosaz.pdfIn PDF document text
    • http://fkhd.cz/data/img/67576704164.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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17740 bytes
SHA-256: b0eb856e646f23bceb61a7cc8d07416338e9b6f9ec1c06308b2d3419e5c0bb35
font_02_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 11424 bytes
SHA-256: f94a53ed6c2914555e1b59797e18847b41353eae9b90e91f4407d41bd0397007

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