Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb5eab25c29aabd…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 21:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 551e7f03e48fa972b2fdbbf74ebd7f41 SHA-1: 87facd84027de8e5fdc77c06205f0e9c595b6755 SHA-256: 8eb5eab25c29aabd66b39eb8012678c4527a57f6147226ba7f7977c7d45222a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised WordPress upload directories. This suggests a link farm or distribution mechanism for malicious content, potentially for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sif9u94flceonccnm3m3n0okhm/33601115393.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1541ab47b09d6e43e9b5f3b1c734f391/4773132892.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/38688711589.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85e3635b0---vafadezi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb96a02e1---famedes.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081894673aed---dotajokojufolaw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7860b0afd0c3b471f63a2eb607607729/96832360377.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6321a4ta47uopiteug6ju599aa/37737689254.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276aea5d63---33177657489.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e51701c99---55861286719.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/tofiluzuxogokawide.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/31802148997.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da33b3c1d7---nawewafejupinapatakite.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/85254008117.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85c073b93e---wakobusomasi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/222mi9a939conb6t9e6br8js86/17871150348.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/70550392530.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26678836772.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/75453045765.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/pirifisowibotefumasagedi.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/39829263697.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/62003236976.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/nurogifezivupane.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/nafenuperixefap.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493c19a8c8---zinerevuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+ar+points+is+the+book+itPDF 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_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16996 bytes
SHA-256: 5862f7a64a14c984e76138f5288620507abbd518c50c431a2e8bb821bd4e2362
font_01_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 10896 bytes
SHA-256: af499fff8b95e25d0785dcf3930888d7bfcbd6450a2c2c0197153b4e8513593d