Malicious PDF — malware analysis report

Static analysis result for SHA-256 897a4784fce516eb…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 22:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 60393642aa69c83bd52d3f54048daf31 SHA-1: 19db5c012322301d513353482d5fc42504d63432 SHA-256: 897a4784fce516eb439ac010d1f8c580452a97c37ff3d1a2e9906dd7339c81ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious or phishing content, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://rayer.cn/d/files/15774084384.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160745a24db45c---rowuzidonixagepa.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/56601496210.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/ruwanikelipukisaz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610274177f6ab---9944835049.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ble6qif8h888a1s60e457li67j/7841881484.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/71792830132.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bf88512f---42296873992.pdfIn PDF document text
    • http://asustainable.com/global/file/vuzonatex.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3dc0d5be9131dc26e5a1485e1623d0f4/44848933055.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///vuduzusedum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50v374htigaqraslf0g62brtu7/vezevubuwevolojal.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cc692f7bab7262936ae77734314decdc/mekofibafajexebiwepojed.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/fedanuxo.pdfIn PDF document text
    • http://taigesw.com/upload/files/14920263024.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d6a6437041a1b8e5d989d7f7c34e17ff/54187521088.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bujotujogu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/penij.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50897283197.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094d03c3f3c1---kuzavekosaro.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68786de0a3aca7706a6f843d1da52e67/23291892225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lutron+maestro+motion+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

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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 10328 bytes
SHA-256: a9aad3f0e4f47d41f5797278adcd8c6b38e02cfdce33c09b367bbcf0fec70658
font_01_sfnt_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 14840 bytes
SHA-256: 4e61fcdf853ec5d83eb65710ce5b56dacc1743366ba633b392492f0b8ff13309
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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