Malicious PDF — malware analysis report

Static analysis result for SHA-256 d224ba0b0352095f…

MALICIOUS

PDF

86.9 KB Created: 2021-08-13 16:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ef66c4b6a33d7147be83266a49021022 SHA-1: 6744709c679587fa29f3b6a26dfbe0495fbb495c SHA-256: d224ba0b0352095f0398083e44816f94a4635efe1e1d45611b6ebb76ef13db2f
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure and a password-protected-archive lure. 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 0.9904

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=adobe+acrobat+7+professional+free+download+full+version PDF link annotation
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/140c21a7cc0eca50e8bfd03808016c2b/96160756114.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/13784173989.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/22944610200.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/71431763782.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/ruxipabetamasunoxazowebud.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/5456302575.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/judonojozolawuxugigaso.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///najurezika.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f21b51aa61cce3092d89c077caa4130/mulejuxubewomos.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160781d3d9fc19---rixusib.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b67ca2ee2cd34335a5a57db0c62da23/54847255380.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/42504239697.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/78845763019.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c182763e---ninokidexefukufejisegiwu.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/bikokebemifomesipev.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62172654e---wewawutugelewizokosubor.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/74945618301.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/779483eb462c34ddefca9a80f7bb62b5/19453586327.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/zajisejapavagizovoziwalas.pdfIn PDF document text
    • http://cl-pub.com/files/files/83906004472.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9fe0423e---44691392718.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb326fc29---23159466984.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d6197b89---29703700993.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/19088572545.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/faxujajapu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/71599354038.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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 17320 bytes
SHA-256: 904e494ff673f7d7100edab08615cf87eedfda316f30a2f9a512d6b0ce575540
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 11036 bytes
SHA-256: 7c680bc4cf4bc31662f9c875117721206826d8241cea145b3f94c3e5d1b86dc5

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