Malicious PDF — malware analysis report

Static analysis result for SHA-256 c952bc8e5daf68d6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80e4e1bc40b1d80ef11df2b4854af920 SHA-1: 85e25e5083ef1f24a2203243e965ed9093965d00 SHA-256: c952bc8e5daf68d68c948a0eecc9ecd05a3f2dae86a74fbb756f74e804139253
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.travelwithtaangoo.com/img/file/badulorobanadi.pdf In PDF document text
    • http://synerfreight.com/syner_upload/images/files/22492734260.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/fikefipabov.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/fakatiwusu.pdfIn PDF document text
    • https://mackbeks.com/files/file/21411786266.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bazosowuzenukes.pdfIn PDF document text
    • http://klhl.com/userfiles/file/35015065203.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/kafigid.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/megubagafenisatorusu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/10459303663.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43b5583de---21169462532.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/sekenefazezoki.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/46053857395.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gumivisadawiberujuja.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210906051256_nvlpnn.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/60088929214.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/megedizoniki.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/52936504925.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ceca72be---98258248565.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ad778672---47966192648.pdfIn PDF document text
    • http://rayanchem.com/d/files/67824346048.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/27792315491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=contemporary+logic+design+2nd+edition+solution+pdfPDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 11328 bytes
SHA-256: 50dbdb3bdff9e8a8ba505b712994f9aaee1e20041485cdc365cb93971c80b392
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 18400 bytes
SHA-256: ab92df614a3207234f114cde64a9e46528952490e16b02d623493de5488953f2
font_02_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1