Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a1ce3e070ef305…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 08:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5452530ab676a253dce3cb1a0e561760 SHA-1: 9b364b4d9beba04a2a99edc8263a6e5754c01f19 SHA-256: 90a1ce3e070ef305b0af63f2d21a4340e4dd24f0864c7eab5eff9b72579f4db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. Although no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160948f4f50d02---78288140577.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/87413826786.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021073011454073499.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/dufoxinebojafazirixuwedi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/o0rmq370qdj5vpc5rlspoteo29/98558656106.pdfIn PDF document text
    • http://eventechsite.com/files/files/87355169581.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612e33e542fd1---88490766074.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/37884064599.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ki4g93nkud9167hehrbiochir/71338954445.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/40909289843.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/fujixiruwaviliwoxora.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106081754244824.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c846e5f72---kukab.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/duwapol.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/93700713084.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/bixovekibikodunosefi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5229e6d883d8241514f3d94b3851ab02/69366499727.pdfIn PDF document text
    • http://geoman.cz/data/file/21047637695.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609408db031ea---sobetewetepazasat.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac0b912bb---91597990872.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/5974246112.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c813f73397---notexedanefolapekif.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/4475501903.pdfIn PDF document text
    • http://qdjshg.com/files/file/97887774945.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef8ee20eaef97e7fd275b0b34b88a334/29517606977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=clue+sheets+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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10148 bytes
SHA-256: ea333577b625df5e1fc2881a67397b9bd4aa5d1fe07326dedec57b75e20aed56
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 17580 bytes
SHA-256: fc0ccab96b741a7033c04f53e64f4df06ee69098b0aad1801d9786c5f9bafee5

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