Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ebc2a2a9c9107f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 07:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ed7e781088ba4f9f17f1eef15f53cc2 SHA-1: 682d3e4e24d40a76182ddb9e816db179f37e1ca9 SHA-256: 81ebc2a2a9c9107ffe8a0eba88ec7abcce5243ee0ba5135f50d6535a53b7167f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this pattern. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ashole.hu/UserFiles/File/kotelum.pdf In PDF document text
    • https://rinducm1.com/contents/files/lironakutumowupowebagaxem.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/48271646303.pdfIn PDF document text
    • https://viettrungson.com/media/Files/1410489858.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/64954741096.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613864db7f859---satowixapopukosefo.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/94909420263.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363fd5c41d---jejakexakexelorusagunud.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/zewisi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/66487316030.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nigesofagulodisugawosut.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/foruzitel.pdfIn PDF document text
    • http://domplus.su/userfiles/files/23908341964.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/50tflargdip7d11nh7ue3rludd/xetulirabewas.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/notunukipadopuxapizuv.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/68055776403.pdfIn PDF document text
    • http://rotang.net/userfiles/file/50349143725.pdfIn PDF document text
    • https://tonitomov.com/picture/file/60423053290.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/fipiwaxiwekumuxa.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/mupakugazanazedevakumuf.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/gasoba.pdfIn PDF document text
    • https://parkettworld.com/upload/files/62741254851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=roms+for+iphonePDF 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10360 bytes
SHA-256: bf5a2ecfdd137853bd0ede680d4b721be4840c04103e465d7558514055560431
font_02_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 18228 bytes
SHA-256: d21a61816b4e766eeb77c4d1c90428d5e7377e2a9057080613a7cbf6065792cc

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