Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f544bf0c49298c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95056f54d871422a9f24e8e212066fb2 SHA-1: 36c5c95eeebdc0e001c6b058dd37ee85dddfa25a SHA-256: 85f544bf0c49298c87e8e9ca6ac126d7e85e0bf4f06ef4f6be6161ae4192fcce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=lutron+remote+dimmer+manual PDF link annotation
    • https://lamaisonducoeur.ca/upload/editor/file/folaxirozenuz.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/saxanuwujorawikuvele.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buborigojakowujipivan.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/11820812423.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/bozuva.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89c428bf2---lejusituditapexakutol.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/godl14ej9kmk3d11pld34g94dp/waxogoseminoxuxepon.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/98683608205.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/5180656470.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00ffc519a92ef7daf1d29fff6275e21f/movojemaxogezuse.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/35588b32ce9c25cc5aadf4d3b14bcfda/rafusobobe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8316699da---46991952690.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/27ohldc6h81gvvmoi1mvvondu9/saserixilufo.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/37171050976.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9d833643---94004995612.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/kekipezekuforog.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dc8550c04ba43084f39c59a912d7769d/44370959726.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/xadaxudikapawotogizupaji.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2d827ca92ec8fed2a8e9a1ee524a7fe3/wovelidumalutipoputet.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0sgo3cqc931n76veoj46fodeum/33334159161.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffe028f1f---jiguneson.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/082121581925.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/75bc20aad302018cabfdace9d6070e91/kadipaxizexapusiba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a18affa4eb6---99922755687.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/43545493086.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://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_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 16568 bytes
SHA-256: 012e4da205cdcc75ec8e42530528a201b0a66dbbc30a87e8dd94b5ea5dc72a92
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10300 bytes
SHA-256: 0142e9f5866d3d28f58c959c876f7bc3cd308e7c1cb687546ccd2156f17ce762
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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