Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d28a0a37d8e6e99…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 00:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57aa83203f5062f16184135095e4e019 SHA-1: 6655d0e6d2445e6a8f05bdbfe1e2252e3aa9287f SHA-256: 5d28a0a37d8e6e9966241083f5d392470ea68f5ad20cba955f19a80631123092
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate these redirects or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://jingyilin.org/uploads/file/76719292106.pdf In PDF document text
    • http://k-ookuma.com/js/upload/files/47656619821.pdfIn PDF document text
    • https://cubic.is/userfiles/file/65562705797.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/ragigutikojojitilu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/gokogadufepeku.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb9f4f6ba---vigowazaxotej.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a42275b1370---sumaxedo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d11a58c6685205aced87ca366238a4d5/2894056591.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/58f21323dc2f25ac3b298af32ec0abe9/kojizoxoriragaman.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c3e40d2---35430878690.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8771fe20---sukilumegewi.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-05/images/files/95844172604.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/56274910527.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9f3e06c---41879432978.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162138620672.pdfIn PDF document text
    • http://technocom.pl/editor/file/bebiduwudakeboxonegetod.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/xabotiponiladesuvovasu.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/94862795048.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad9aa617d---63286665240.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/tobuximurinirowufopag.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/jupuramutalebujagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cry+wolf+patricia+briggs+pdf+espa%C3%B1olPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 11268 bytes
SHA-256: 10bd4b034c2fb4297f5ee9e67f943c02a9d3ff7bf5b4263c6ff974c0b4113736
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 18072 bytes
SHA-256: 08bceeeb45832ae7689d83759456fd484eb69260264a98e1e98bcbebcdbdd855

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