Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e95a7d1cfd30ee…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 06:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6c115ad59e90f369c50daecda6e8d2b1 SHA-1: 99fdef6560c6cdea446124820ba2837bf42c1eb8 SHA-256: 08e95a7d1cfd30eea948e7fa8af38017db33601f8f2626ae943a5caf94bd54dc
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://drafthe.ru/uplcv?utm_term=grand+theft+auto+vice+city+free+download+for+android PDF link annotation
    • https://stotex.rs/files/15834655697.pdfIn PDF document text
    • http://szpk.hu/_user/file/butikunipirage.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/buwofosekepibezivomu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/1683461519.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/48459481891.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109120731131887.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/36479165381.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/worubiwubirefijibuzozo.pdfIn PDF document text
    • https://businesslife.com/content/files/95336334661.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/susuwinisosoboxedevaw.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/10163170730.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mpgfh1b9huoohnuj88l3rptut8/66797892804.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161361d95433f5---90889215150.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334a050dfd4---xonirapovebeseluvavefelon.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/kosukizejisok.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nifive.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sirumaxali.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138078912985---8278144240.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13991994695.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/turazixof.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa51004c7f---pepivewimibodi.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/18113900850.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/05190707933.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bd35dc56---mewadelobezavup.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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10808 bytes
SHA-256: 6a33f8a40d05efbda029f52d06bc68d0cf093039aeafc9b23da0cc425721c923
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 17204 bytes
SHA-256: ca4a7fe10e49f51d8c66476e6078fe5fce0f1e8f1b738ef679bc8f07aaab4be4
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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