Malicious PDF — malware analysis report

Static analysis result for SHA-256 c286a47d5bb16a56…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 07:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ebd16a661c6530eebaeab42c13b26cc SHA-1: 7b022dbfa94553239209fc0f51383a0c4eda7ced SHA-256: c286a47d5bb16a56f98d7f62daab1343a3a01bfdcc423082f87987d952d3b410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple external PDF files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such hosting for malicious purposes. The presence of a Google feedproxy URL with a 'movies download free' term suggests a social engineering lure to trick users into clicking on the malicious links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://martas.vodrsport.cz/uploads/files/nowaloboraxunigib.pdf In PDF document text
    • http://xingyeknitting.com/userfiles/files/77627757690.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/zuwujotadelozenudekobokal.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bedag.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/75425236213.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/99816208616.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c81012902263fdfbe23ad43059bb2f2/44004776774.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9aba92640c4ef582c4cc0ffcbf923bd2/renunudomosureranevasa.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/81423653234.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemopizixowaxixas.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/74137336327.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/bodotanesi.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/japezisonulemesos.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e0dee4e1bbeb5b3db9a5ab8d79b063a0/vikipojuva.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/92214821444.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/31627783721.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/musisewixuwoniraxarosus.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/gisuxa.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/gaxilelozixafevezugezig.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zuzogobafixefudawidagafi.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/81901813007.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/guwololane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=movies+download+free+for+android+mobilePDF 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_off0000adf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 10700 bytes
SHA-256: 018ac536049ef30db191b674ed48826e6a0833b06c8899994f33a8bc367f333d
font_02_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 16488 bytes
SHA-256: edea15b11d0fa04234ba226624e6f36b28f590673e7c9ddb2ced51e9f3fd7d0f