Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d81240f02f6bde…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 10:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9eccde0348302133e40db057f4de4d5f SHA-1: 8dee1499c35456edd4518ebcaa69e8752054e718 SHA-256: f9d81240f02f6bde5c9488e89e5c4262fc432930cc9b6b0cadbbc82604708229
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised CMS upload directories. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, as indicated by the URL containing 'utm_term=free+fire+mod+apk'. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://coretry.ru/uplcv?utm_term=free+fire+mod+apk+one+shot+kill PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba25c3c9c---3864087565.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f1d9002a247e9ea63b84e140558f7db3/rejomupowusiximanumo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lojupuredoralofup.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cc554102117f287512d282bab7c81d51/33080297175.pdfIn PDF document text
    • https://phnews.ro/files/file/dubuxujaxeduxidivujaxo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jazobuzawuwujov.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/14702638655.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/mawukejepatogugi.pdfIn PDF document text
    • http://nova-auto.com/upload/31183330206.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/399468229.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/15280565429.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/81445256819.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zedivoteginuves.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wemotuwojewoxog.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/tulokasuwenir.pdfIn PDF document text
    • http://cichanski.com/Upload/file/batemi.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/88386443975.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pozimobinipadivobatara.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/wuvigelurodejusutub.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gagilexazikowetep.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/ligoraxusitukakogurunara.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161382ae3651d8---24056576549.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/riniraxevo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142fb39fd7---fezigalipudizalumo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141163a23236---59715085485.pdfIn PDF document text
    • http://twilaw.com/files/files/lofelaxo.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_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 10832 bytes
SHA-256: f1a2f8b5a183e5294e319a92a6258893682bebea6339578e34fb80a4bcc91aed
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 17872 bytes
SHA-256: 06a890e0b459327eeea1ee121da5762575c31f8f35d6bff209e40f192efc609e
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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