Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1adb62801bc98…

MALICIOUS

PDF

84.1 KB Created: 2021-07-16 22:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8dbd00133a454594126cae458a163ac7 SHA-1: 82673d68dcde32e859c82c30123136591dd49e1c SHA-256: 83d1adb62801bc9887c3697f89139038f47822acddcb6953808120ed2e228c0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/jilawo.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ec202a6d---basisuwejudapuxuwukewunex.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/85717224092.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/nikupunofirepopegixogo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sukobalagake.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/sudubepo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/jiraso.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/238ef716a42ebbe223b27e698c8313e3/8131544606.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb17a816a8c---2230718688.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mh5l97nj3a93e00i99hi6i3p5s/vikidanadi.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/5899146195.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d0233506---zuwibimabiz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d33a4f2---gakivowozonul.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d634149d---68460619504.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2bdvgoc3s7sm4qtfh76o95a5d1/polok.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fvoh16ijojnison3jjcgg79361/lasepanepek.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769ff27945---27767724222.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/fuvekesopujo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f15c7f5dd60---16193766054.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210515020242.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/97717598461.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/8817500057.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/88131849731.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/bisubap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=acl+recovery+protocolPDF 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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16980 bytes
SHA-256: f80e1003b6703df848f1895d092febe6c5444a11a3610f27140bd6dbdd9549c7
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 10004 bytes
SHA-256: f665835a451dc1530ca2db137f65182f695243a94673f1c718d684194c40852b