Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52fef55927728a1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 10:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b024a7c39500714b2657e121e1b5d8b SHA-1: 0e490d9366c54e783cbd7fe5afb12f9f08e2eaf7 SHA-256: e52fef55927728a1ca3a40d9b5941640d61192728468af49b810c5d7861d613c
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6494

Heuristics 5

  • 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
  • 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://tentauto23.ru/ckfinder/userfiles/files/mitasevopopaxonax.pdf In PDF document text
    • https://systematix.pl/userfiles/file/19902372963.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/sitozawuz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8dfbdd4e---87995577170.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161429c48f19e2---buwexezu.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/fibuf.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/86563935802.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/54692967125.pdfIn PDF document text
    • https://masihpt1.com/contents/files/jesesukavaritagu.pdfIn PDF document text
    • https://blokhol.com/upload/files/tesol.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161354de38e690---wexewasarejagalojad.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/71975769134.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/lerotadalejofelufoparo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/50111479439.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/korij.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/53257718030.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/46790011586.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/65769971234.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/timesepuzamapu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/15418203318.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nidizazisikakovuzofufatab.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/rubarapulaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=foundation+engineering+pdf+notesPDF link annotation
    • 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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 17120 bytes
SHA-256: cc05d420f7d53d145697f1ddc54fa8068ee7fc26c35efcc877990be9f7dfec8e
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10704 bytes
SHA-256: 687bc041c639ab9a68d00bc972780f3a8719a4bed5d8fc2cddffba4196ef38c7
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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