Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f69e9cb5bb2014…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 03:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 046acede21f553599ffbc88a26d820d5 SHA-1: 51b4a41c320ddcfd888e69ae638944898ee83aad SHA-256: f7f69e9cb5bb201477b5a8af7057fb5365874e00a688d25f7dadcdb260327d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b112510c84---65740859435.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e194648b3eecb490022334858e91403f/lusitalarazisanibez.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/36401326945.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cef23d9631---57711488660.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ef0fdccc8d9321c697f81ff5f95b165b/6382324664.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tuwikumiluna.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/22578191482.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/lurufitinowikukusen.pdfIn PDF document text
    • http://rvhifi.cz/files/file/87946335500.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexuwaxef.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/92355004195.pdfIn PDF document text
    • http://skupka23.ru/upload/m/5301339106.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/xudetes.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1281652478.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/lesetibunix.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/14823485751.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/91335081158.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vonitudadoloxabix.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/naxineduzofoxojanejolekil.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/23420821516.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///pufiwofuzobivagilezoxa.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/3548520842.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/fomoruxegefexegejifalu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210902132940.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/61142049031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+free+skins+generatorPDF 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_off0000b9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BA 10412 bytes
SHA-256: 166c45d47541aca86289700c3143356fbf3e257b4331bc7854c101af7e429f40
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 17128 bytes
SHA-256: d52ecdfb55e8e45de7a85d99617f4651cc7bce28ed3103a3be0ddbda743869db
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1