Malicious PDF — malware analysis report

Static analysis result for SHA-256 c153f12889d65530…

MALICIOUS

PDF

98.5 KB Created: 2021-06-13 14:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 64ac86873bd85194227675f2b2b22e60 SHA-1: 39fae80a5031e49a3ef98dedbe0061cd90edf5fb SHA-256: c153f12889d655303a93acaaa323520da8443b6fa684f54b5e27b9469488e835
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to "Howl's moving castle theme violin sheet", aiming to trick users into clicking the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=howl%2527s+moving+castle+theme+violin+sheet PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/49bee0b922047583194e76e8dd0f5b4a/50627100269.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pinifu7l280c0k4i9e180kgqb3/36359021459.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa665d6028a---53721350579.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc922af91f---99521361279.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/35830806546.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/11105bb8669a4bced58de42765af0241/xobijazovabudi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fibux.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fce1b2f6fe7c8ac89879db5ac22ff26f/41393941642.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f70732c9d---tuxofukukope.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/nkf6la31ofjeoqgeaqm386ekq6/mozeporaliwoj.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a6206c834ffa9154c7a1076c467fa3b2/42845733836.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gu1t4vff1jjcrneuutial24lpe/gazamowogosefugabexusabiz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/298ae55k2dpj86gr8grnn1qha1/84908060968.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/23270814551.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca392f538---8855098954.pdfIn PDF document text
    • http://vtaky.sk/media/file/dimaxalilomin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 18924 bytes
SHA-256: 43d0d717a7ddbf35f92f079e33626e5b2dee28393fd754c0303c27b06d595a12
font_01_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 5264 bytes
SHA-256: 196c82107ca5a3fda2f445ebcc0cefbfb8e7e01d0dc1e50953204a79eb97b5e7
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 11960 bytes
SHA-256: 6fcd6dcd84f4b745fe75d95919f09d0b58f3335ea44b0db4b8961158a751b0e8
font_03_sfnt_off00016759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16759 16192 bytes
SHA-256: 296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57

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