Malicious PDF — malware analysis report

Static analysis result for SHA-256 e565364eefaddd25…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 01:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09a0133866d101d7f69b65df275fb176 SHA-1: 3b262b19a06bfc172a6c0fc6189b8099c6da0e8c SHA-256: e565364eefaddd2580657e7bc0478fbf17f88db889582880476383870908b5d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://rucodelniza.ru/userfiles/file/bukadosofav.pdf In PDF document text
    • http://bezagsecurity.cz/userfiles/jafodebukulijorarenex.pdfIn PDF document text
    • http://benetalent.com/upload/files/somaxigowan.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/ralosipev.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/30799529251.pdfIn PDF document text
    • https://educhina.mn/editor/files/99579010376.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/41873018089.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/129994078860903932ef43f.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeb8f0df7---21152704134.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e858a8f175---26601262991.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kilimawukilajejesoxovovod.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca554c398d---zojeretajugoxaro.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cfa68dd03---74222242279.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/fixerovovusonuretegitov.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d8593141b95992b76ed516d49944a924/pazupajubedanetakadizitul.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86044cb2fc---7331154445.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/wojepipokuvivusi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e94p4taqa75lshlq9mjmnv2v9i/54535996516.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c301fd83b6cd9319eac625ed488389f9/90049203585.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jexoxatodulinesazus.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/92064811203.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160babed098b38---7354905851.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1df71f29c6---66764687729.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/jiwodeze.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/95583770205.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/makazatenonobufowagib.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160865d0a26196---98034934687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sequencing+numbers+to+1000+worksheetsPDF 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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 11280 bytes
SHA-256: cbb518bb068067b09bd0b5ff5b72003e6ce43d54e621cb74a0352b67914f0832
font_02_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16420 bytes
SHA-256: dc3b8d099c183bc22cd4221d5a54db920a5e00c782f76a2fb260b79b4c0302eb

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