Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a5868991cc2e0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2da607bb8a87e8bd85ced9d7364879f7 SHA-1: 228e626d9ae22ace9ce144e5401a6d1ae9f7bb67 SHA-256: 4a0a5868991cc2e08dcfa03a06b4fa924d89bbf0b57d7af1be011d531be7f29a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=i+want+to+cut+my+hair+short+but+i+have+a+round+face PDF link annotation
    • https://jordan.si/dokumenti/file/wubapufowefofibufufodom.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/77052065719.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9fe5bbcc942704d1e72c3ecdd7b0c242/36776902173.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/tedere.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/25667917719.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/53503940458.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/vokedubumepigugejorerate.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/21372116499.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/21932400710.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/ginokuvawaz.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jogoxele.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/60478080191.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/47876193640.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/jewogatav.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/parosovof.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322dd3a451f---67701287215.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161414b710bbdb---xosikofuka.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd74c8247---89059741693.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/3107311936.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vasuniwokawepulo.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/viselawukamatiwaben.pdfIn PDF document text
    • 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17152 bytes
SHA-256: babd3934492be2801142ca5ac84b4a5c9b13cfab2f25a06a929dd287a2094a89
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 11152 bytes
SHA-256: 44b7c11ed0a71d29d3bf36f9bad80a746126e94568762d1de31eb8ca3676a4dc
font_02_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1