Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f4bcd6d46c2955…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 08:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e75b03075747889769250972b7fe0fb SHA-1: 90c8292f50c107921ac960a76c3f61995237934c SHA-256: 19f4bcd6d46c29555555f7213a324c5818564edab466412acb05da8b6e4974f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://casalindasbakery.com/ckfinder/userfiles/files/55303797967.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6e2047dc---newutelilikigojodujod.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/35691530046.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/sarerafafigoxegekevo.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/dazami.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/42100280165.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138a29515f7d---77888366833.pdfIn PDF document text
    • https://curvy.tw/upload/files/wokelutixisozilovesazu.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/43874957992.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be7454819---gifuvada.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef1981e8c---mulesisofixibefimagasapi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a324b094681a7354b567aa7bfedc33d/mibapazemosibisus.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/93759479525.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gesiwizowup.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/545004_jiwozivezedenafoku.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/62487069079.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xulijodesutomeduwupofax.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/38064350954.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/57731041712.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/magakexusomepujaxowim.pdfIn PDF document text
    • https://ewt.cz/res/file/lekigedafobim.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vudasaveje.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/98295673438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rehab+completion+letterPDF 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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10656 bytes
SHA-256: 2c7f973f01b3eab3790ba4a445ab8a1c01c7e4ae47fbc4b2c942dfcf9e7f8a2e
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16840 bytes
SHA-256: ddface2c8996593d225ff304cba1d0a3604d6638420ef4c96e2388859a451d97

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