Malicious PDF — malware analysis report

Static analysis result for SHA-256 952d86e63cacbef0…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 23:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60f6e5ab4c7d64841b411a49c55e1d82 SHA-1: 57530d60c170b4e37d40d151a312cfcf646615a9 SHA-256: 952d86e63cacbef0b9ab9beb2f3cf02b3eed5c2ed61b35ebe167c92c16b9e487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of many external URIs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=watch+the+old+guard+online+free+123movies PDF link annotation
    • http://villalapinetafavignana.it/userfiles/files/77760369940.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1n3qqvuj9uq9l0tsiuka9099q2/56640865453.pdfIn PDF document text
    • https://terracell.pt/images/file/72885805822.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/risukedarepekufazodo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/78130913369.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142da37c578a---57220625268.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/11115997788.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/tovolimu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bb6bffa4d45c7f0488b2c50d405fc125/dopegokewupogiriduju.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/vajufosumumikuwerelevepin.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/31711633080.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/92551767069.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/83372084531.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/72340636578.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hv99f4hcf2e4ld3d8fggeng0n6/66327930671.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/3263747214.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/63740725256.pdfIn PDF document text
    • https://allianztc.ro/files/file/begitog.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/92260695950.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/85429153944.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/40802624050.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/mejigofidosofiwatus.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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 15216 bytes
SHA-256: 65fbc1f4a36dad68bf0ea8917a248f5a53128de8720e16b61c859e809b5842a6
font_02_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 11424 bytes
SHA-256: 8dca300a1d083e2f2643f81a67bc775dadb5674e84b3a7794c0c100607a74065