Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f3bd369f24178c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 16:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c27447bf1c2e73662dbac081da53ec0 SHA-1: 83f91e31084fd27f05aa586ae0ef86a4c3e2b259 SHA-256: e5f3bd369f24178c7415d1b427b028175bfd99a516d1a9def25e63a82418dc05
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://towa-aaa.jp/userfiles/file/81223255355.pdf In PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/gowelalitu.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/68495888185.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xedegiborixewizewesij.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/bofubefuzuwonepuga.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9bb6baecc3e286b9bbcc2fc4c3fe89ee/29512291241.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2f846fdfd0e12f2589e83f47bd8c4ccc/79914254923.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea61312c18---22779978930.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/96462511872.pdfIn PDF document text
    • http://hak-al.com/resimler/files/fepevinoja.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/8134908040.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vivebuwamuxavegevar.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/44796881742.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/zusaka.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/zesemufegipadule.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tamazuxolunevibebimenoz.pdfIn PDF document text
    • http://teraval.cz/res/file/gukowavelujut.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vejorotox.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/51258571798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=final+fantasy+tactics+2020PDF 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_off0000b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16716 bytes
SHA-256: d7a76fb59a0ae0741242c9c4cd24c0324cbd001952fa9ce8870ea35db2ad454b
font_01_sfnt_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 10312 bytes
SHA-256: b8245aa331950455e5636eb4546c2e8b29ae2ae4c1ed52c54c9ff7b3c9f6830b
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1