Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ebee3960769cdb…

MALICIOUS

PDF

78.6 KB Created: 2021-07-29 13:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 356e48bc08f01f7a3a7ddb6b929a6831 SHA-1: d058e14d854056df925e7090bd2ef4ac08e90fad SHA-256: b5ebee3960769cdbde1920ad23747de56d2f35b3289194793f6356492f11c5f7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://stpeterscbs.ca/ckfinder/userfiles/files/daworasukaxugaxolug.pdf In PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/nirijufesidanarezejales.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sejakadimimogosezevudiv.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/14700101155.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/kotuzuvodevisutafipax.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/19071175856.pdfIn PDF document text
    • https://service-panev.com/userfiles/35760330809.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/66c65d3624862257b8e07054659a3eff/45253910559.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/rofiwaletotuv.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/71329981878.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/56751d3e904bb245bb2282ee630e32ef/dapekamibovalafogu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1rck1d2ffn8taou7b4jecdj1lb/95278598617.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082c29479bc9---mijubitaza.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae141c0accc---suzitam.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1aae82d0e439036eaa956ba49352a238/basijokusotomizola.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9239b374---gozenasinuzorogo.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/bafebividixij.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e84f4a749012e3f5ebddabd12bc715f0/xugodoji.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078feb53629f---62333216021.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/lolurevegunabufisu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rvmk8r1cp0hshrh4i3nd39n7sg/luvumolelanewewiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+track+my+phone+for+freePDF 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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 10816 bytes
SHA-256: 2dda64d4c409229db558046bc049cc7a951b4abdf16ac1449bbcf6f6ab4226cb
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16040 bytes
SHA-256: a42d8982068bcbb34935ebf4eb337a310156c6e1589a88b94211d8e53cd7d7fa
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1