Malicious PDF — malware analysis report

Static analysis result for SHA-256 8984dac5188e9c63…

MALICIOUS

PDF

92.0 KB Created: 2021-08-03 16:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79ea3d4efeb3c8d9f4a29986ab738c20 SHA-1: 9866f7e7ac0fcd52aac25f8cfe24d3ccdaf02691 SHA-256: 8984dac5188e9c63f1406314d3e14783c488c5468b3e8d0f5accdab517fab24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, indicating a likely phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and link farms points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://bajrahrs.com/userfiles/file/2135416103.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/51132712345.pdfIn PDF document text
    • http://samtekelektrik.com/files/wavezoxobip.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sk8g2rn6r77plhk54ien00g05o/pawaxidaseke.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbd037631130f7ec533891c66e3785f9/zojorunuxe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609114805ad8b---82022359204.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/17062030363.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81753220252.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160fabf4841e31---39260881090.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5124ba64---lokek.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e8421be2---dipewetazovubuwalem.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/52707429948.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af60f35410---71215805470.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/tujijikire.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kuxikitametugamexa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zafojiganeveguruzuviri.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/55458379711.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f44e9c1a---67963937807.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6gj1cuq3of65qul0pm0e08c023/93115361523.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2ac9e65---kajatirokur.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/22966088369.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080e91269a3a---62735647905.pdfIn PDF document text
    • https://aedwea.com/upload/foto/purasafuxuzevafid.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35817783537.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/91bf34a1a94fd13085724ef64856f55b/93845138390.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nipekojijazonup.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wafuzaxeterokibidiwizibap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=city+car+driving+free+download+with+activation+keyPDF 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_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 18260 bytes
SHA-256: e7675cdafb0a74c6c14c0a9952cdd657091a58099fc9b32cdd21ae8a1c0eb892
font_02_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 10976 bytes
SHA-256: 572e70fbb54301b78abe623cd6db0debacbb294af6f65c65ffbcae645a1b8b65

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