Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8ef30cb3ef053d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 20:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a5dc1090d900269deb19881d668c469 SHA-1: f4a64409b8133340568fef395def66bce9fbdbbd SHA-256: bc8ef30cb3ef053dbf47378c6d8d0eeba9c5b669e72cec2cbc683211adad59cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads or engaging in callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://houstoncoinshow.org/FCKeditor/file/madukanegujak.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0gbmevr8rieom4mni86gqlq8nl/93330504924.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/66984588645.pdfIn PDF document text
    • http://altus.pl/userfiles/file/52466026775.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/jomezeboxanafuwededozilas.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b3f338300470e47ebda4136d0aa6e703/polisorelawesujita.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12475556129.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72d0a02aa---subudininajikikawefanuvuj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/7571068121.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/94653972051.pdfIn PDF document text
    • http://vlajamo.cz/images/file/dixidomavokulida.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/botolem.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73926808171.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/45655594886.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/55662748602.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1a65e401298297c7f819e47a2f5b2a3f/nokikilejipizimudatoz.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/53782122781.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/52ef0a69e08c2da11534890795f54d32/7481440578.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4e068ed01c814256305344031b1e588e/83641414333.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6na9aourt861u5pe7kg0s8lt63/76745493379.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/84701998606.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hpnsnjqaa502207a7oc5cfi05/kavaw.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8166b8ef8---57433473997.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/bezabuzokoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ego+chainsaw+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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10516 bytes
SHA-256: 29976b6344795cf625b593cc9a8c1728e68c8e8bc13d174f6960cc2eb06de3f1
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 19308 bytes
SHA-256: a4ebe06d9fb06ae8f664a7c20df97d30e348ba8b6c2a870789f656db2368e941
font_02_sfnt_off00014c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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