Malicious PDF — malware analysis report

Static analysis result for SHA-256 22730843eeaebe92…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 16:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 845589d805123314d5c24e1c58a5472c SHA-1: fca5310c25b9b8ce56f8529951b4898a67a11c09 SHA-256: 22730843eeaebe92924f156bf0e849af2e17590ab8934450b8e5decf15cd7516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ankle+pain+no+swelling PDF link annotation
    • https://observatoire-omic.org/documents/file/tonasidiwuwekef.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nibev.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gewod.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/deluk.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6bd016b6b51f870b6fa5be1e6de94343/78155234289.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/pupexir.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/kutarowemasabojuxatufudo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b240e9dbd8---63112838248.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c37ab8bb---58678317280.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3c5910c0---6299252941.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8e29e4ec---tesugala.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608796ce72ab9---85491600984.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/52860007415.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kejijenaxiseru.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161009ad9a7916---49966580329.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/88455546057.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/mazumapobabubipelugaf.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/godele.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3202466a52---25207518236.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zipovenudilitowezadotoli.pdfIn PDF document text
    • http://baove24h.info/upload/files/70925294379.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ziliputakimexofumega.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9e23f803---jetenopobu.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tototevupekumuwemukodo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd65d0c9---bopivolibilarutog.pdfIn PDF document text
    • http://markone-tools.com/upload/files/judavupibisejifalug.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_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 10388 bytes
SHA-256: f8da51d5b479430cead744b5e55fadc04826d9a9b77fb2d794563098da09b963
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 15096 bytes
SHA-256: e33f155785e2eba17981b9b34558137300b7744f3f209ac9b092b003136a051e
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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