Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f8ba862e11748d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 03:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36e173d38be4024599e31ec4c0e62a4f SHA-1: 6134e4009f6687dfa46710bf31a8b82e95f6b942 SHA-256: c5f8ba862e11748df71b1f90aa040a437031520c4f960c09a0ea9a39acb77fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://dekoblickfang.de/userfiles/file/rawuzitatow.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f16e4ae0d6b59bff8825cfacf8c3fdc8/29453692052.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/8894992483.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/45625715651.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/38974367803.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/47209376931.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8927e7ef---93637752887.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f7c6757d7f4c0d72a6ef4436844373bf/biremidawevavomuwo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ff492e585---40506653144.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9efd03ef90afd0eec141077b1fc889b9/sugaxudopez.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/bt6r4bt2ckf44flt7eat8sco1m/23856847053.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/funuzajaneli.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/pejewawagokikop.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/83189220888.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d32d260d5d39157f1fba56b24c12dfb6/zikagotawenizebi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/36d1690f86b8be8bd7a9bfbc504867fb/51974091756.pdfIn PDF document text
    • http://asustainable.com/global/file/68692842751.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p8rro9rbh1vhgcklcb383hkoe8/85381277247.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t1enta6bgfiiq4j8opan3kctj5/73388721281.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tjpgcoechnsam1717ohkr5ilfe/burusemapijas.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/38784192208.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/90781240345.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/73070513229.pdfIn PDF document text
    • http://belloverde.net/emailer/file/59220066635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=order+letter+pdf+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/13027930798.pdfIn 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://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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 10344 bytes
SHA-256: e7c60c29ad45f90212a5c342d99389dcee1806525f200a6e6a217609f1d199fc
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 17300 bytes
SHA-256: d588f1a0bde1ed20293baa0f0bd0d690216aea4d76d90c71c4d75c139b2c4f34

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