Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b03c643beff8ac…

MALICIOUS

PDF

87.9 KB Created: 2021-06-12 23:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d4e6f357a5e92f80e386f4dfb387ce83 SHA-1: b6550dcc3bae3ea2705ace2b31c24daf45c2466b SHA-256: 36b03c643beff8ac50d4c17ab4f2ca11c46e944bc5972acb0213627d447bdb7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=jcheater+gta+sa+apk PDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8qpp7dm3sgomu4gq124gm9v8pk/93183428673.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e5acea667306bf339e310d429d769f8e/29225255770.pdfIn PDF document text
    • https://tavio.ru/files/file/numafumetu.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/benarogesep.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d02e3587---52292351730.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/nazukafasimovutajemix.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/53670937924.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9515364---34639929777.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/3934888078.pdfIn PDF document text
    • http://healthywithhart.com/res/file/7863960744.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bfb45cd8---79783412912.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/39347213693.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608311bb11da5---worukotajewusibe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbpgvok7l80hj9305tb4ifs0b5/vuvibazavapofumewitodo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe061bf7977d99b09f1ba285f34d6186/71519126421.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa9be7bc2---15898810333.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/96051034526.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 4740 bytes
SHA-256: 57eeeaf138fdbf9165783f95e24cc03baed757e698bd3159c8d9fae8830170b3
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 14148 bytes
SHA-256: 1b800263ba1b309758d016b9d076c14ebaf111c0fe203c80796ef4ee9a9d1955
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 17112 bytes
SHA-256: 2699f2ce65472362c7cce2649b9a1ca315f2f35cd4c84f2de76f8c9cc61a5f56
font_03_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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