Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71b079a8d85a7f2…

MALICIOUS

PDF

77.6 KB Created: 2021-07-23 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 744a3b743d4fe7ea10dddbeb588d7289 SHA-1: 63a10935f6635507ec6ac9f078c089a958c3dc46 SHA-256: b71b079a8d85a7f2371fa16cc17052001018fa78138dac307ea638a6d32e49fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous other PDF files hosted on compromised WordPress sites and disposable hosting. The presence of external URI heuristics and the nature of the linked files suggest an attempt to manipulate search engine rankings or distribute further malicious content, potentially leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

Heuristics 5

  • 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
  • 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://planet-pvc.com/upload/files/gukamipeveleredobifuxaza.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9mrc5gvibae6eien86sa835kf0/12763418825.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/7758735047.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tesezaviru.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9927948375a6a0645f4c65fc68a3c02e/wujizobubujajolowevosovut.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f77994a770affaf2eb15c31061fb281b/68464462189.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a9v22qsg7hekff29t9qbaf2020/47826739693.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49a74f09f---vaxixe.pdfIn PDF document text
    • https://alutat.com/data/file/3383442862.pdfIn PDF document text
    • http://ktcz.eu/files/files/47307878421.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/04f4979be94960553c50f8078379a6d1/tamozugi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1164ef77c4972c17742dc0215208aab9/gofawusexunozolatikuru.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ie45sn6thfr0mko0pn2ivk5fc1/57216526996.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fokixunakuba.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c26dec0f12edfdd4f1a35ee4e5d7d1b5/98329573180.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/180e214f45b1cd3cd238b4d50105ef22/vedoniji.pdfIn PDF document text
    • http://yepuco.com/uploads/files/33645112617.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/kepabovowapel.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64d6e972f---vetizakanazuwatig.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4h9jl5dcj1uimfk5oa5qv8doo7/rububabaroju.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7ba00ea9---92358730365.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f665a2382d---bapamawaxodazokomuzura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=operations+and+supply+chain+management+the+core+3rd+edition+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16628 bytes
SHA-256: 01ef49ee68449825870cb333d16075b6fc7258ffdfbf4ded2ba6fa5c133503de