Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf405c145b3afa39…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 15:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dd3d6d3ef4bb4808f17845893c65fff SHA-1: 069e4ab0e1e5c5a45a7406365d656a64d6978674 SHA-256: bf405c145b3afa397e3f3912623ad43977feb27d89d6828de3a75d380d40131d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, suggesting it's not intended for direct user interaction but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://stmarys-perthamboy.com/upload/File/62063693178.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cccbc9110641920877bf3fec116ce097/letijadotape.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/48552422780.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/43853145868.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090500111080554.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109091946464554.pdfIn PDF document text
    • http://onelove.cz/file/xoxukidagotalapirodetumi.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/96467840711.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/77287465015.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ledafusuluzurifegix.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/68285249031.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/gevane.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9ad95882da62d7113d782a9245eddd78/kalarigazuxiw.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bifigejax.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/15919828294.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/97440376587.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/85783251501.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219642d6db---tagavutu.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/17945723123.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/30076936355.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pojilul.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/14260684364.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/gofaxomizaj.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/27991540290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fun+games+to+play+on+androidPDF 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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 18284 bytes
SHA-256: d73489a98b307ac730b9b3568c28b000c0a6252a811b56b95ea3a2768b2feb8a
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10928 bytes
SHA-256: 5a2580aa6214c0df4d447d75fab96fd79f6d7ff4d3138ff4ad0a92cbbc922ea8

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