Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccddaa87aba776a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 23:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10fb8c2719fc23f2d50f4bddcadddc4a SHA-1: b4f08922b5e5a5df26c696d2ff48ddca1e593c26 SHA-256: 5ccddaa87aba776af2ebab91f4274198cbb9cabf978b92c6958f5dac9bb66794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wxeina.com/userfiles/files/39985697098.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161291eb7c721c---56096983984.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ecc6fa30---40811164268.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/g4eus8erjun5n6serqcb47cvqt/94021075471.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086add01261f---21659564214.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897e531ed7---87511948115.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/menoravukesokipuvida.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/71673829792.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d068862a---kodiriket.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/16446420466.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/34264332630.pdfIn PDF document text
    • http://poorclarescork.ie/images/75002199960.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ah8kneqjn2qb9ohdnmajuda0n3/tuzixetomubajemaka.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/60275259596.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ca35846---rigegedamepirekuton.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/84170389639.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee36ac5af4---9587385580.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d0e724a1b5e1045b6d2616e0cc058cc/6277139708.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c60d05e8f547c4fc478ffcac6b8d3c5/gozuvabidunonolugewudetup.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nibakimazowamedojola.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/lojejeriw.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gazovazobafovedajexemu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/11701623668.pdfIn PDF document text
    • http://webursitet.org/Files/file/pubotad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+comedy+bible+pdfPDF 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_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 15560 bytes
SHA-256: 0af7451ebabd741cea3c72f1c4c938c271c5bff0e63779e551c6ec7e162a75fa
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10468 bytes
SHA-256: 5217033f127d83cef6aa106a5fab6e570a494448a9dbdabdbb9138e70ee01146
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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