Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15b8c2aa361840e…

MALICIOUS

PDF

102.0 KB Created: 2021-08-02 17:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9b78506deaec5ba20a44a7c53b21c6a SHA-1: 55cda5891b9cef7b7b9bd9071f25a1e3d88ad6a3 SHA-256: c15b8c2aa361840e76af6723776a5dfabd9f050a8b1fcb92a207b4f4f94db4ac
156 Risk Score

Malware Insights

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

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 multiple compromised websites, likely for phishing or malware distribution. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/54db2d0426d50b48f1fcc57e3e960d9b/wiziberugirafeda.pdf In PDF document text
    • http://bjjiffy.com/upload/89005978059.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b757228a7e7f3b19d54519b91333803/kezimuxikamogipu.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/zapavakeramaxenexegogiz.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/02904140bae68a8645351d70e018ee34/ramukesonefopob.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9f410e39992fbd7d4da311a0e713f87b/keruvisemon.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/nutamixibuzojabororos.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba0295bf2d8e0e8f9020471cd1c9e96a/38477270029.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/68669355563.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nukukawititonog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/82517526245.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/fegabilabezekoxodiwe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dceacdb8---sebakolitewidosug.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/koxobizerizajarefoxodo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/6195427207.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4ff367b5---48567255430.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/15968031251.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/683213b57188bd61e95a042657c91e85/toronawefifi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/8261888682.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c67e5a835b---sogepesajizojatopirat.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vodazagigelati.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/766124c7697e63c23d36b2ff1b853457/17617524111.pdfIn PDF document text
    • http://iwishop.hu/file/tokonesi.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pegilu.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/50197122362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=facts+about+gothic+horror+genrePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 17352 bytes
SHA-256: 9f77840e5995780ae9b4f1fa1d697be8f6178d6ff4b270a76eb76cfe0d81003f
font_02_sfnt_off00015810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17027 10680 bytes
SHA-256: a73896c085266b2ab057e0b444d12920126d641e37ad40a34e65dcc48eae019a