Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced1dd850ca5dd96…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 20:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdf9a11b07ddab575b60c4d33c20ded9 SHA-1: d70537f480c3b8cae821866d8cbd6d42f044bcef SHA-256: ced1dd850ca5dd96249bed6ee41fb170139bdd699bd57f4e927c88a2ad83f29f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d72a7aa4---vexedexiwumes.pdf In PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/kapelebedaduwomavibez.pdfIn PDF document text
    • http://picassooutdoorliving.com/fckeditor/userfiles/file/37812447891.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/95423479727.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lupigukesoweluvojot.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/gopavovopu.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202108170156564955.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4bf4280d50aafa092c1e6ceed1e8257f/zikijiderekijinidegopozif.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079226a68311---53240892007.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/petososibabofitekuz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e617575cc6e---xewapufadurer.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/xamirutusemuzademadejipu.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/xejes.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/japomapuwalebiladobug.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/000dad6d38470b2b87aafec9e8ea7241/mevuxaneroxokekedu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140cb7d0db---sebos.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/87474294603.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/oprmvt3oh2oj8jpm02i0bmmut6/67439096414.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad870bf004d---2579298747.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/28701276148.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4ce675d4---sukikadapobisela.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de91679ad7---danovi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5cba3fithc28mtv0ij5f19r6rg/89312335997.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a77kuo9s002k3viivlb8imklm3/45504629822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=third+grade+math+workbook+pdfPDF 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 18796 bytes
SHA-256: e38b550b8a140f2f57b36d62ad38f6bfc31418aa1dde3d153030cbb0dc12df01
font_02_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 10908 bytes
SHA-256: a8607f14be5f3394cc363749dfc75136acc0db2b9d861f19f181babd807e1854

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