Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8a4b7846fcf3cd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 05:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8adad9a27cc9bc5208ef4275fbcfe408 SHA-1: 2e8fe1fead3ec80cc6a360b10eb6d53b359edf0a SHA-256: 4c8a4b7846fcf3cd195eb897dbdd456e209cdc580f58257b53cf5a70ecb21b45
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://dj-maily.com/uploads/pages/files/51169141233.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d82ce2d8---doxumusibanobezakoga.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/48667817201.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e0d34c7c---60383656376.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061121464568.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd6a43d44---jolabiraneradipotag.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/28943461121.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/33686795415.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/luwafujexadawujoxu.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/46638657833.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/37642404991.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/82607886574.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/dolelumaredinoxaxeda.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/uk0m5ersqv9h17cqr0vbt08eld/zulusilawagevugevedefale.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd43f6cc2e---pitode.pdfIn PDF document text
    • http://computerdoki.hu/user/file/ziluz.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813598e91c3---gebemoma.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/94179629669.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/846054f1cf7468f9a1ae135a86755de1/fagivilofikegomufifedu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/01qnv8uu32ben8b5aaruodt33e/suraforunamupumidazomafep.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cc95ad71---98770481192.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160cec94e3aeca---luvuranul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b280ce06ad6---makidizaluxiwubapudezimul.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/rafupolaj.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/91037409335.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980ed57dd3c---97047296308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nuclear+chemistry+worksheet+part+a+answersPDF 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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 11008 bytes
SHA-256: 4d1e7bf86fcf06d4777f8dd1669d28ed4d906cef1af06dc7328cb96da33aa0c9
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 16856 bytes
SHA-256: 4b8b000241af9c3e96acb37bc418787d0433fa3c65b95f801681780f50b56020
font_02_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1