Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c39454e2514ff7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d01353d071d8f54108b70ecad4273252 SHA-1: 9591c46c768f38f3275f93f11027ec494d1a4fe5 SHA-256: 10c39454e2514ff7682b69915c1d08bab1da9cfadabc7731972b3c23c649249c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/c3slmr4aff6ikorn0uabf5q8tr/26731841605.pdf In PDF document text
    • http://feach.ie/images/uploads/file/83185398472.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6d8a7b2a---mibomu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/36855579923.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/45306386980.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sovibupimijaneli.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/656fm4v684cbmiglcp9enf1m92/85642338315.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16088642d0358f---69837142042.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/16597652443.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/86908914953.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/nedimete.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/n0ln908pbqg3h773sjerjnorip/rorowokorivikukatoxewepe.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kisududokobanedadal.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1b08abbd7---xobefuzuvaw.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/31891864643.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/12559261141.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98620680604.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18bc6162a---jatiko.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dmjjggvrteplc48sqqv3fou6e/11947534473.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/78803963236.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/madonesofiduzen.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/xivimokalijofonizojo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0575320fc---gifuti.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/50035676015.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4248043d---jujunon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=converter+pptx+em+pdf+onlinePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 10528 bytes
SHA-256: 58b60c9675835915b441f9e03235d45a15d4b254cee71d46fa82ad135a9c4098
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 17300 bytes
SHA-256: 2d833592f3d9443e818fc1e4ca74f247800c4ae6c4c432f48357ade822f661d5
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1