Malicious PDF — malware analysis report

Static analysis result for SHA-256 288e7a6d9acee73f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 19:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a10f8ac62699f7968b971d2cd69f274 SHA-1: 45cb1aaf1360718366f45b6966127f642b329202 SHA-256: 288e7a6d9acee73fa24ce80a9be025c6b1d984b5a8f54b794568085d56b87797
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting, likely to facilitate the download of additional malicious content. The presence of a visual download button lure further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cleaner.pl/userfiles/file/58506189916.pdf In PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/desudamikunuwig.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d4d7d888---42446958102.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fizovusobapujepofanoso.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a731c2a14f63c69f0cf202e9cca2891b/wemudumakigode.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210914111648_gouetl.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/13780468609.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/bogilobegokufunuratu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lazivusazol.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/jamidiranaxetabepaletelid.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde13ad73d---99772260295.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed0dc4ff---mazuvaniropevezuzozaxubo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f89100c07468f0bddb4f4c1ecf813be3/30035774218.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/jofokalizeboji.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/40920201686.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50278388070.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/572a0f5652ad9028ccc20756633bf120/4436084437.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/90098002264.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/purofalarelazamiw.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/bapumukakat.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d264da03---4934161209.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d0dp2shmtq3icajcij4unebuc4/80369848325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=krunker+aimbot+script+tampermonkeyPDF 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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 18144 bytes
SHA-256: 8b0c5f81712757fbcf4530bc58174c92f194d774d7653d44d21b95a0d22aed83
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10928 bytes
SHA-256: 1c9a9673d3c242b0831305c19a39e77da4e8b32fe62a41e45b719768c8762d52
font_02_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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