Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccb5f90ee231c14…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 19:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40b41da735872232dd6308e311635fc1 SHA-1: 6aff64f568722a2fcaa78cf8398b536552734073 SHA-256: 6ccb5f90ee231c142b2e36974fc250013ec0463b97576fc42e6babcc5b93f344
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=laporan+pendahuluan+fraktur+antebrachii+pdf PDF link annotation
    • http://salon-urody-bellis.pl/images/file/29078819196.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c570693bd7c4f14f14ac2d73e38bd43c/37167321359.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/31539102121.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608177a7d894f---gaturuf.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3epvpff3jc7un2boabfvjdeu27/53131073667.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xapulefakerivix.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/33649029452.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98230d4af---66865595512.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/64958256171.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zabasilupajifiw.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c19b9210a4a8b4e7d115327ad4c16b8c/7219245505.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/dokigilu.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/varutulabalekenetejiba.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30ca765f2---sibujiwuferima.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dbbb3968b---tevovujikasupuzulov.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f1ts0u20eh9ebrfp75anm36fna/virekobapifenejerag.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vmqimribct9nk2ecl3aeh45o25/tujopelikigowuzozifisonan.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38734499946.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/mokugozov.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/pawiledejogisobasedojupam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c906ec5---nofinidudejo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zegope.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_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17520 bytes
SHA-256: c55d00c07b81f6f4e2ddb2aea28b1cc9f52cdc9b558af603954d6132fe317392
font_01_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 10836 bytes
SHA-256: e428dea1790708fe3b35da708419cc25641c1fbd45470da73de38dd760fe1fb8

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