Malicious PDF — malware analysis report

Static analysis result for SHA-256 763c8296078364e3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3465aa344568c237d8ef138e052b2079 SHA-1: 9091504a6a6e9d14e19ef9e2384ae77b4d0bd29f SHA-256: 763c8296078364e33be276b5a5e4e08643a450c93d05a4f8a56da8fe5fceb243
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f67108401---41739479651.pdf In PDF document text
    • http://inggeo.eu/userfiles/files/39118774605.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef04f6b9---vosapenatujukapaf.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/lugutodipinigenozinop.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bf92e1f9---6524759552.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/98713811459.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/28691525563.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wofenowabenanixuluram.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27173404360.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/74013072756.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093afaa8cca4---92009185715.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/18487634051.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gisefaxakiza.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/84e4c3729e609bcc00e30e6415d71c07/64455271796.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/xigegi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/65753abf4aad7e9fd0e176d529a821bf/donoled.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/11413144894.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/suvujerapolazosuteweguv.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/jazagodu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29768885d0---12833839172.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1ua09u1m9raktldmeb3vjd3do3/34462960584.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/82a50f12fced5e53ea0d03ffee14902f/jomufipigeralulexef.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4ea70fae---80933051570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=roskilde+festival+2019+schedule+pdfPDF 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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 11280 bytes
SHA-256: 65ffbe751597a46cd591dba59ab6659859fc7ba5755b880863150bd06e799c1d
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 18908 bytes
SHA-256: ef3941680bb16f923c16c9ea57aea8e595b5d96ea034a958473e23e013cb3e25

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