Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7dc3f432ca154b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 01:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b7befd1c7651dda8c353026cdd727762 SHA-1: 81270a5757b6c5935528992c8aaa9f45cc5139f4 SHA-256: fd7dc3f432ca154b12f1013252673055dcf9b4f95393deb3d4e9f4b7630a8d45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://cructi.ru/uplcv?utm_term=quantifiers+with+countable+and+uncountable+nouns+exercises+pdf PDF link annotation
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67c6eb794---69040315988.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c1337f6---sajezuzara.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/digotizebagutenubokuver.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/kaveja.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/zejobozixebadesemawo.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/xinaxizomuzevojetobenep.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077066428134---79768470058.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/romagoje.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc504b5fe2---50666941507.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/kinigunuvixozeje.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/60734162024.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35073233107.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/dopejusamim.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/bizivu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee84545fe5---81428661717.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/46190383798.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9acd3caa---70744769441.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/25332ced9a1187a8aeac07934bf65f9f/28937563503.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ffaf04e---86304693683.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b94007a56---xedumalotodalizuzaresu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7955c813aab04e9f5ebb42ea06eb0833/31806863391.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/tudepuluvukazi.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fomamuso.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2abfa58523d3a3700f8392cc19bfeb61/jupelukunedosakum.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/dipewidikukokujepimiv.pdfIn PDF document text
    • http://ccshecea.org/upload/files/34179426019.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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 18876 bytes
SHA-256: 9ab288566fac042f5dbc5d6ebb614bb657980c999b8be9b90daa84dd57237d63
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 11204 bytes
SHA-256: be3512dc98ba46b1319be2cd6246cf9068e3c8dc354bb00f49fdd2a0518b0816
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1