Malicious PDF — malware analysis report

Static analysis result for SHA-256 835798607c17abc0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 02:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0d7b22b7610af52d95b7b36ce03c0118 SHA-1: 5280a82a651aa868c34b1c0e35ee4d16bf682fb8 SHA-256: 835798607c17abc0d10a19c671cebe5be6fe51e86d6617c02b37d25db8b61291
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/zotitipeteguru.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/05338ef36beaaf802fb1e0e16a6ba746/kozikolileragak.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f41ab58d2---jubedoje.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/23773745950.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/biridak.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc644f585---25399558655.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d3e851c19c7e10a44d19a29cad91374e/55082750350.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e76174e9b---73942392084.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/3794229476.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d7af0b422c0eadaadde9196db8a62746/fosarojuzibisazew.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/jakigekejin.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd0576035---sajuzokafupapobagobex.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/83029784.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nvd3oe1ekr3svgk61j3fc5ijcr/54632112433.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/timibapununakisafi.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/jepimitup.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/87796160181.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tilusizetawozes.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/26174549327.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/nimopixuboduzotufa.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8a12af09c4f83b91848a38172dab25f5/julekodikeregodejekob.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/24911259263.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/gaxomuxotevaperemavudada.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/471731138.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/654ep8kv90jgs8hpr09lj3srch/rosalurizisodaxodasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vermeer+1250+chipper+service+manualPDF 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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 17636 bytes
SHA-256: 4d8bc5e14027ecce54525b44402ca21524caf7cbbdba99395f3866be4752b2b4
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10984 bytes
SHA-256: 4aa82562a1f225e8580db27e4c444bd2f340311a06643a0f20db2b4c7f3c9a9a
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1