Malicious PDF — malware analysis report

Static analysis result for SHA-256 910b5f6ec44b3c0d…

MALICIOUS

PDF

79.5 KB Created: 2021-08-29 03:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47fb77fe81f0c211f284f2b1953e183d SHA-1: 0775cbfe0e9d1d40d223306e308bf699598ddfe2 SHA-256: 910b5f6ec44b3c0dce880723b7469fc6d4e9391dffad2d816ed4b7558a3991d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which are likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dc584f8fbebfa7481761a81033c772a4/75805158672.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089935c6b709---76723031982.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/26124688465.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/panojutizubalupojited.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5faluhmeai102d8q9226la7vd3/ranebefopezagixivawuj.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2ecbf311edff131660c67d46e8ec6d96/sukonebesenamenebafovog.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/84720647539.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/sutaludisirokepikafal.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210626054602874.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afa65915---sazituvoniz.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/10334918263.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210812012158.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c56889631345cff0351a7f41bc6d33e2/38148324729.pdfIn PDF document text
    • https://mszukam.pl/dat//file/14632588965.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/34944e027df5d59cb4894962231d903b/ruduzorubuguwetejawuz.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8dca190e9ad233fbb9ef9c743de6421b/vazexelolapege.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tuzanakudewivebo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6782f3050---44695545329.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/1824877928.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/70475992695.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/10f48114e835416ecab1558cc0009fe9/2107915759.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/67d9b97155b88608ebb98cf26ad53c4c/31055503568.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a040c0896---32200600097.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4529bc7046b9348082defe4481e4bd0/66370734170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=if+teresa%27s+daughter+answerPDF link annotation
    • https://lapdonline.org/file/newefuter.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_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 17984 bytes
SHA-256: 8c130014da08f0584d017188a450bf8cd9dff79a7aaa912aa219b838c86c6d03
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 10548 bytes
SHA-256: 5d30aec322eac9a4b510f72edaf5927c281428b88c7299bb17a966f5a6164235