Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f76aea6aaaf977…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 07:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c681b337009cc8e0df6adf2023ee52f6 SHA-1: 25df7f4867137cd2fa4b6954ee9575cafcc6eac8 SHA-256: e4f76aea6aaaf9778c7c38c8f87d67b1f50eccdccac6320c0405e64dba20e0ee
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users through search engine optimization. The presence of JavaScript and the link farm structure strongly suggest this file is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb68d96c80---97618237688.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/77vjmvio8p1aonvdmb2ooq8dc4/29473082711.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/81962985123.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/52578019494.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/lizimixu.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/71253055661.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/losaferubutodawilawabumer.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c850784a951---26978830366.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/99485865334.pdfIn PDF document text
    • https://simorgh.it/uploads/file/88085385330.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/teximilo.pdfIn PDF document text
    • http://generoussecurity.com/uploads/dowobugakebamugezikexow.pdfIn PDF document text
    • https://assistenza-termica.it/file/87150544396.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23298c2c6d---fofijebidojezilakoxax.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/75638080528.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/443db33c550e42a0c05b5c62890f39ee/72221843512.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/56225561113.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e6ee8c966fa0922c69e4b099e76ebf2b/13480957376.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mogm39sv0ggtd1qiugo8nr403b/22448357917.pdfIn PDF document text
    • https://ubranni.com/uploader/files/733937810.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/mokegubinorezojarixefakov.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tifanetepusa.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a11sdbo8jvtal9vgfjr9fnvvg3/kozedagutarok.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/sogotikotatirevi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/acb77041d33470bd7590ae9d5e04a246/lovepajuvarar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=polaroid+pogo+camera+manualPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/26105918411.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 18480 bytes
SHA-256: c51b71cd0015c600b97cb7f5dc99fda78841db35f6bed5079392a1e7829090e6
font_01_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10692 bytes
SHA-256: 566568905a8ce0964c55dde5e21cc437f64816bd8e598594795ae75111db011f