Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b98cb79ebdd6b4…

MALICIOUS

PDF

93.8 KB Created: 2021-07-18 12:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52c4688f38e201abfd4b5322b2798ea0 SHA-1: e56eadf52244c3d20e4cae6af57a4f79da5a0e91 SHA-256: 06b98cb79ebdd6b4408c95c0bfcaf2c0013ab0f65c5643832e05c5b350d31ecd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the overall detection profile point towards a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://championshipsportsrings.com/clients/23492/File/sajozid.pdf
    • http://asvpp.fr/pdf/15148987621.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82006d2fdb---17627340215.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/52597a4897e7d4e9dfc0aeb79d7d3777/zebewisosixadife.pdf
    • http://foto-klub.dk/userfiles/file/17242526157.pdf
    • http://studioagm.it/userfiles/files/xuripew.pdf
    • http://sacoorhealth.pt/site/upload/file/fanevuguzibovam.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7cd975d225a05345d4ba045cd3aa2ce0/38326740893.pdf
    • http://parcroyale.hk/userfiles/1289971049.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/os13jl41mbor1fni82s2968k54/10207568226.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e81a2b85---taretasinowiwunasejaf.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2607a67bd---85620333264.pdf
    • http://joyearland.com/ckfinder/userfiles/files/nupixakotonolowuwato.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/57511934048.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1a9cb396---77218370718.pdf
    • http://educasters.co/ckfinder/userfiles/files/dufitixakuwarilopiwuj.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790be2c1979---88899876618.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vrbofff8kovv4uenqa3d99m7k6/likeseruf.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/60019643084.pdf
    • https://kisikana.hr/userfiles/file/rafes.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a15ff6dc3f5c418ffcd16c932221985b/bixebelativasexisulugawet.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c1d23fb50921d8a6ee3f060e639fb49f/51990946111.pdf
    • http://tksvolga.ru/userfiles/file/53532175958.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/20862507484.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/kijelulafozabidogudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iq+of+down+syndrome+patients
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec9b42633cd356eedd766402762e54ae/fafufoxozibutimafugapal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d8.bin
cc089889412a50e045378dad2a61edcd2fb663e76686b3b15867ac980ac34899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10912 bytes
font_01_sfnt_off000121f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
font_02_sfnt_off00013a07.bin
99936386b93276db2ef6c8847e21df4a6ee1deacf69e761c7c0718224b2b0a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 17588 bytes

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