Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d34f227b691371…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 13:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9ced82dbbc925a11d16926717c118e7 SHA-1: 90b62a8f98c140d3353e01ad005468fb6ba991d5 SHA-256: 11d34f227b691371ef9dd4d1f905d3018241871c784b1447d85551cc841984ea
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to further stages of an attack. The presence of compromised CMS upload links further supports this. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c55528c3d---87673510233.pdf In PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/juxefikugovavofukeki.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/vabunojune.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xakixuxuwezeguwugexexo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/88084077073.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/55650376413.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/fogurovemimiv.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///13492867454.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613463ba6bfe6---xisox.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f9i5mp7jh1u0pso36qffqi6i3t/5247790931.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dojuguvonowenululexusaja.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/49913402623.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389b96d3243---gokimenira.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/56572272820.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/99161529092.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/vinenurukukedevovutewak.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/81274293934.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/scj932hjq063qg4pkeoo9uetvm/xilekufaboledakasugo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161382efca392b---kuvugagagoxezugisififik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+connect+my+phone+to+my+tv+bluetoothPDF 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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 10612 bytes
SHA-256: 55798894876cea794c5c1455e7e687456f8ea848fa997521e97775880352028e
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 17120 bytes
SHA-256: 8872d7294db3ee0e8b3b374296f3155355439f73e415daea069cfe2027d69598
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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