Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a90bfeff59b289e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 22:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c86f7d047a9f582b95defeb94db8d95f SHA-1: fd0b6d470e517661efb06b183897961fbc2a5eb7 SHA-256: 4a90bfeff59b289e3f91f6a02a92675f33081bb7d5382c1be05125552b3c7765
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phishing lures. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://chiesamadremarsala.eu/userfiles/files/jejusufuvofuvajaled.pdf In PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/13963523025.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/giruxevuxuzosomikarumanos.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38b9257d90768a6bcd9ca815afcb96d0/4077389839.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/ginaferodosiporiwonedome.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/44016115406.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/gojinovizun.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/29428512847.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/546083044d6433e0b5141f29d86f68f0/31748776485.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/rufijix.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114367b01315---25819180129.pdfIn PDF document text
    • https://le27.fr/docs/file/69565538262.pdfIn PDF document text
    • http://blueyee.com/upload/file/261031284921.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086678ccfc4c---bodat.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a201118ec00---pivawafe.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7426b135---41437894841.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00565842eb---velaxifunevegarababutere.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/muvudawufuxadom.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/74047570526.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19a849e00---95252403524.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/54809082266.pdfIn PDF document text
    • http://sowitech.vn/upload/files/36290698746.pdfIn PDF document text
    • https://greenways.at/userfiles/file/kedijanuw.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a9b06f71c3729bf601f9116868b5d43c/81684465383.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160993a7e41e55---zefimijavevujotizi.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/43880776408.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/25310984259.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/864a94859e583332ad6ba1be6421a8c9/12388403220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=predictive+models+with+categorical+variablesPDF 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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 17952 bytes
SHA-256: e1eb9e2e9888322156ffefaae307b25abdcb404e8a9dfec0bb19dde59f052af5
font_02_sfnt_off0001313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 11004 bytes
SHA-256: 2bb0c5c06e616085c7492f8709896380cfaebada0fd4680157f90a95d41faa74

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