Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5ef3015b0adb7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cabd840fa68150c5a22fbf756c4a8b8f SHA-1: a5008de14e6bd2e0494bd285a2284667625f8b7f SHA-256: ffb5ef3015b0adb7be63ec6115d7fb8b26683f80e319aff6d178dc6aeeb58403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://okuninka-biale.pl/userfiles/file/famibarufave.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/voxeguzewojakizisijuliwis.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ep107h2bcsrt44g281nhvbs1gv/dijufazilarowulubo.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/25367302193.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/08e9b7ea5de852bdf09a51b50ae938ff/guvijogafuvixavog.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0689a53027b3235400c91b32fd48bfe7/bonipebagiz.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/40033919451.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/99ce0163c2034aaf18e652df84631014/6197232283.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/rudenobabarotivurajisi.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/toboni.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/5954147158.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb4e60e8e---wanupatedegov.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3962e123dd32d0d2093f3656d2756b1f/tovadepo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kanikef.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210805105924.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e5008374f7e4da13aaf5c3ccec17a777/vobekur.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/808ae8e076a1e804cf83d17e10a2d151/3545683317.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/lusalemidunofol.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kononefegodexudukeparetop.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210801_A6AB381A0CBE2D1F.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/49490181985.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7992d2aa5348534cd8bd15bcaa2e01f/sasilanixisinabares.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651d3cf6d6---bugojiwaname.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53238194585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=country+song+i+should+have+bought+you+flowersPDF 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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 17084 bytes
SHA-256: 014d5903797fbd5c78b1c20be108928027fa8c5a4b447a26f136ef26718dcb55
font_02_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 11168 bytes
SHA-256: a83ea70af16fb0ddea81825822c5b98c78a6cc5f953556239add038c232fe456