Malicious PDF — malware analysis report

Static analysis result for SHA-256 e433254a593073dc…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 22:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfb94ed6d0664f2e8c3d9b500c0e74c4 SHA-1: a63327033dffe6629d26f86344659ed59d3d7cfd SHA-256: e433254a593073dcaaf73cb34a179041b960512cc61fee255b601dc6a59822b3
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/aa5c34536dc6aa071aec1aa1dca4c5ac/revaboj.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74552980616.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091104251473499.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/naderupexov.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614948a149f86---25331305430.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/26034181142.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/widobuj.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/126839ceb39bc202637bc4bbf2da4043/buberonupezokoje.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/digixafigexupuge.pdfIn PDF document text
    • https://mashura.co/userfiles/files/wozexugabi.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/vobovegesumapowiz.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tepewagoletol.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/28600029363.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916035402809974.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/35183498370.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wuxazodobedenozinokunuzaz.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/numofarobafi.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/kidazitedududipeg.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/visusox.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/keweweva.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/92734525612.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/86942907900.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/pimekurakavuzixujowil.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/saripopafob.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/pamekosuviwumowukozube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rog+turbo+booster+apkPDF 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_off0000c1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 19244 bytes
SHA-256: 670142ac1ab8a84324425b6a87c55d4f3d42a59bfbfc192d15df1b903cb4e91e
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10564 bytes
SHA-256: c0e1428fe67dd3d8413bd0d92be029a1b7e300d5ecfdee25dbbebd81f1465c7d
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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