Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3330fb510017569…

MALICIOUS

PDF

88.5 KB Created: 2021-07-20 05:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65f878b5fd5453fcb8cb905ab925fa32 SHA-1: db766375a96e0f837e9edc3fb9a426e29c6ff265 SHA-256: e3330fb510017569986870d109eec9a8458134041f43649149b27077e04ddb64
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The presence of multiple links on compromised CMS uploads further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/df17f9386b07f93dff25ad880f91356c/82203060002.pdf In PDF document text
    • http://lafenicealcamo.it/userfiles/files/lexofonazudovoxodapuvilub.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9d9e6d20---susobisizasupagawase.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714de9d320c---10718884147.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e6232618---xalasikudawegonekokeg.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vfjdf71rg2nlce8ndk8eoh5gf1/3519477012.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/um1gk29e04rjrk25bcu69rrb81/tiguxaxatatuwodevanazuj.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/24450396517.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/morazutofo.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gemojozugijukanewar.pdfIn PDF document text
    • https://paperland.bg/uploads/file/77529134893.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/jefukugugitizibana.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb00efd56---vudedaforonajopofotuwa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58bf56711---todesewelikonimoruleduta.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/zadutedodijafi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e7cb7fa2a6614aa5ad891454a146ba24/vunivakuril.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/afb59e11a7adee29ae58abeaadb5df67/43130121484.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494447b75e---lumawufoziluganami.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gbc8nn56u430m67hf35eunbc89/18043163605.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6a7c7a725cd4a105cb6fd4bd8eb30645/zozenafifeb.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/37150808833.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c232112d32---wafekarosixodoba.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb17e6d63---61738231906.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gotebidofidabawazutus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gb+instruments+gmt+12a+user+manualPDF 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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 17188 bytes
SHA-256: 0c690c6bdb24170943072788ffdb7df56593a6abf4a952a96ca09d19bfe5e122
font_01_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 10780 bytes
SHA-256: 6bb400931a2bd9ac19e5f790e074622ea9f3b92d691da2dc8cec794ba96af5a3

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