Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c43383de099796…

MALICIOUS

PDF

119.5 KB Created: 2021-07-21 01:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb424349199786945b2099683e8a06f2 SHA-1: 9d4c3c27b0f0f7e84db464eefdb419db07e6a88c SHA-256: c3c43383de0997961b37edd26e74d69dbfb6158af508a94b1ef3637a94b75659
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to serve malicious content. The presence of external URIs and the overall structure indicate a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://liebherr-tr.com/userfiles/file/93913961041.pdf In PDF document text
    • http://naturallabs.fr/userfiles/file/13701755476.pdfIn PDF document text
    • https://ivanamihic.com//files/16350974895.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff59495377---12723605557.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa82e691657---jatolemoli.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1d63f265---55736956880.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/75074695357.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/48307017757.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/63997061418.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/d54d7048f6d930965dbfdb18b4efd260/nafofav.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a419cab53---16426983514.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/260ab35bb0a1bc02d70d319a6a3b8ed0/74413818339.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/3122635191.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rezujarunotuwake.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/98608777122.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/73a8809293825f0a312636a68c3ee8c2/50805176226.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/guvabimopuzewekegero.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sumuwuxidaroxelovosujo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36d4786bb---93408834084.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/063e8ee9e4218c7cf56e5ce91ef01b99/vakofez.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210531_5F14B3C0AF9A0253.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/85633734565.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/kadikesuk.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/23c7df229444a43701c7128bce38fd80/52625542012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=black+ops+2+zombies+guns+best+to+worstPDF 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_off00016d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D92 11368 bytes
SHA-256: 1d594c91aec81f908e89dcf62e2dd152a5789f9b198325c397042cf7c0cbe837
font_01_sfnt_off00018855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A067 18356 bytes
SHA-256: 8b378ae8c39bc88d84cf97cceba5cd2e66f2c51dd3eb6840e6e8371d2f4e1ae3

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