Malicious PDF — malware analysis report

Static analysis result for SHA-256 e293f80f179ce794…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 12:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f63bfc7338f35770efd69524e1ef4216 SHA-1: ac64bb2211ee288e277ac16af78f607cb47376ce SHA-256: e293f80f179ce79418480307be57ccc84f8eb0f02a335d997504039194657e5b
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 0.9940

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://medvor.ru/uplcv?utm_term=windows+7+32+bit+iso+download+mega PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6afve60blq7l2j4k0knqfav1a3/kalajatefowuzumijifisulu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ogle3jd60jq4oq47klt4tr2kc5/52091603472.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a62d46cb6---14632121851.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e4bed25850d88f122f168fae2d90023f/15207142079.pdfIn PDF document text
    • http://wjcopy.com/upload/files/8733922295.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a95b03d80---12341006510.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/pivujuzamafapibefisoregu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/63023435075.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c5222a2bdd31b38b787559c8eb779987/32209288597.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/82145539098.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/xotilil.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/36263316691.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fb73c893ef7ab164d03d85382c8696a9/77419075161.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11417817---18649962354.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5430a70f9---84421818042.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nuwiwidi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/objht5jgn46tt88rn5mq8bmgqg/gejimogotuvofeposobup.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/12904469180.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bcaeo2pm5pal12t2lq5r2cdug2/vavezopodilovumifiwuv.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b806b4957227d4f6f96330b29e05a336/4145813057.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537ba96967---jakajewutavo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9c86c7c6---11608366992.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/diwunuzenosijexevigozavav.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202161912206112.pdfIn PDF document text
    • https://mega.nz/file/hcsUjAAa#rLy-T_cXQX2p_xV2ZmU7eeRV0WslWqg89477c8U1AtoPassworIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 11052 bytes
SHA-256: 434a8d4b4e6e6de73bcb7fca95fee83f90d3663e87d74847ee52fc4cad2b8cc0
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_02_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 17472 bytes
SHA-256: 3f5b770f1e8f408ee6446179e38bd3c2da85ddb91510e46f72c1776d86c95ee1

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