Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cd08003e626683…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 23:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 59e9dacc7d707d12ddd576efc8b0d246 SHA-1: 986594b002189c76942c632b09469829d771b1fd SHA-256: 45cd08003e6266833871d5e8a991cbde8b2d325989076964ffa079b07352f85d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Past simple exercises and answers', likely to trick users into clicking on the numerous external links present in the document, many of which point to compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://laborke.ru/uplcv?utm_term=past+simple+exercises+and+answers PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11603b2ecf---wudilidinazebofatoru.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848dd16bc1b---60246612924.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/wunixadowir.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097297154215---82849086307.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3l49at1ip8jn5spqr4mkshn5l7/61374314657.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f6411cdba9427e2327540a64d66af687/zibogorofadigobezes.pdfIn PDF document text
    • https://tavio.ru/files/file/jevul.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/90469589981.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608357577ef58---37105857578.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/315e4710bc4bdfae880cc68cf7ca10c9/senujekav.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160976a05470c9---pofejipizulazetivumis.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607804c136496---dotitopezidolob.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lexezupinaxufoseni.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xovetaxafe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87bb16db---77929451786.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/22731970981.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade8fc2e52---xupivoxozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5056 bytes
SHA-256: 7b0edef8f3a6b489b8b6eae751195061dd3bf93376e55e3c09c7f49fe88e7ae2
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10856 bytes
SHA-256: d7b0f020306290016ab08eb1588d59abe803cc2e6ca46b7993580077e011db8b
font_02_sfnt_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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