Malicious PDF — malware analysis report

Static analysis result for SHA-256 1750a9ef743a5d3b…

MALICIOUS

PDF

105.0 KB Created: 2021-08-15 05:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d96c6a6828dfc57aaf152c2470c6343a SHA-1: d6604d54d2fecae630bbc1e9e9bdec22218a06cc SHA-256: 1750a9ef743a5d3b7589f70580f19e990127b500acdb47061435e5ceedf68894
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, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8019ce02f6ca30a8a0129a496f1b92a/tekozuwigijibuxakuze.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/12385815449.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/wuzenemezubanipewototu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f199b2afc7---97441261965.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508012953188007.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wuwagagoforinokobam.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d14895521---difewavetazefevetulez.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160723d5e8a660---gepidezozekonogowonalaxok.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ot69litbbm3ht7b9s56hv5dth4/nenewepudupepanukopimaxer.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nusuwapebalo.pdfIn PDF document text
    • https://estoniapools.com/contents//files/dofusutetizamisekodovovig.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/dipomodimimilu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/sujav.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dibubasi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160841571266f3---43062517391.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092290569383---72040342902.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bajiluzabaxuki.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aer7lji67ujibgohefeibj8fp7/xogunofupewopawud.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72e2de66e---41674103532.pdfIn PDF document text
    • http://lyshiying.com/d/files/13763465093.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4p29dcr965stmisp403cdg7td7/kajemarulojijebikanegip.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/74356371043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=baldi+birthday+bash+mod+menu+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 11004 bytes
SHA-256: 9f6961716b43d7086821f0b7d98a6627a94aa045dadd9be923dd3a712590a5dd
font_01_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 18004 bytes
SHA-256: b777bf7b91600d265d3b6835f7681eeb07fd35cb673fdbfa5f91ff3ef957608a
font_02_sfnt_off00013f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 24332 bytes
SHA-256: f2ac5d089baeed60ace258cb50990e1377c5261da7a5e4904411c140ff6afb3c
font_03_sfnt_off00017d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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