Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd33183810da3f41…

MALICIOUS

PDF

93.0 KB Created: 2021-08-14 14:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c4f3c992ccb140c151a047a0016e99b SHA-1: ff549136f5d62dbd23cef12ddca4d3351ce3b526 SHA-256: fd33183810da3f415723d01f2707832471006d4eb3605b86c7b9ba6a84a40ef2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://unicornccc.com/ckfinder/userfiles/files/62886458014.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021081205392228.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/galipuwatowodugijeb.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/70568572103.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675dfe76ec---kibetoludoditezepimewemal.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac8194f16---60635015002.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/rafegave.pdfIn PDF document text
    • https://isosklo.cz/uploads/bafiresobimefozugiperi.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/66212136709.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/38527693255.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fae42656---jowekurevenirudegonavex.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/08957d4e631538deee175369cf01f0d4/5994751329.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/phba4hrqacd2ccht8bvl1f8m42/49472638172.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/32072992104.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed36c91b0---wifezipesivulevujukaba.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/80189360466.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/6837679167.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bca40f16---84823767839.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/numoximitiw.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210801115952_x58koz.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/23106957073.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfd559718---dojotebulakevemigalojaba.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/483b4eec20584369f97217fd7b7de0e1/43378937971.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/namusinenu.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/7fc3dd3e5132c82d7c94b302024ef77c/4116484493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fire+hd+8+tablet+16gb+with+alexaPDF 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_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 18064 bytes
SHA-256: 0607686206d13abd6c3b7264200daf3df1c31dd616e1bf0a660a8375ee020222
font_01_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 10868 bytes
SHA-256: 32125ce39d9faccd21312c656826c2f7e3dded9c1b0a30e16d3467f3f1a406be