Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6b2aa8e7e2ebb0…

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 01:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b5f52a3e0ab3db8abceae170e960451 SHA-1: bd5d8c95e187e45e15b219f0c906224572013842 SHA-256: 4b6b2aa8e7e2ebb0a00e8256d627833c68a21552fa821464963b316d13ca9b0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristic firings indicate that this PDF is likely designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d081b68f88---59996624436.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/mazoxap.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/6d6ceb9a1739cb1c2b9da7605d4df428/pelofexowogidukotufedom.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k3quqf08psbm4hss3mi5v09eh3/rabav.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/lowuzafominowiv.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/topibufukutifi.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/54750696200.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/62009297083.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78be8239a9---61841475407.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/rusebizurerivujosinivop.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/s1055acj429l5i17ljl1gh4o53/jugarufalu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16096d742e680a---69394750451.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6032d648aa34485503e6e5e4cac09310/3819527434.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428120341174.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/tasofofofifemabezeme.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18ae095cf8---bemixoguniruvi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a97ea9de---87364139614.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/76360923300.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1656aeb5c67c8e25e1e3456fd3d63e6e/87616914231.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/83k9og0tdns1n411ksnbkiqskl/28113238581.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/635a26fb3f5d26cc5774a405571d080c/sojeguxif.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zagoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hutchison%27s+clinical+methods+23rd+editionPDF 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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 11052 bytes
SHA-256: da6fd4fb7f7c3dc319293982353247b1198810823fd55638c8b3cc217453af66
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 18020 bytes
SHA-256: 85a8b11b8e53708fa0a6777084d59a721c9b847b6a99fa5ed6347daee0cdbc42

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