Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca48731fac779098…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 03:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb0ea6eeadc2a0f5ce39e7ea32e94e8c SHA-1: 1035d7aa6b11f4bd3485a4d608dc791e4b50a31c SHA-256: ca48731fac7790988ebcdbc95065c62fd77be4d94b2118da2fdae382df35c371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://energywork.pl/userfiles/file/dasifebajulupize.pdf In PDF document text
    • http://cassotech.nl/site/data/ws/files/30459264717.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/sewepariboxexiwuwiki.pdfIn PDF document text
    • https://membermimpi.com/contents/files/57385368314.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/sededawizudijejuga.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/binisezarojiz.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/92217569088.pdfIn PDF document text
    • https://costarica4d.com/contents/files/35809546806.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/guvudulajovakipupowad.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/meriruvuzikogisejevuwobe.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161461fd0eea0e---33794719410.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zavotedosig.pdfIn PDF document text
    • http://ridendo.cz/files/file/48042671285.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bad13a8bb9e0c1351818e85fc1b7c3d4/ruxoxujotusefu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428894d9fae---20437829180.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/kitopinoriwubizomawivazoj.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/popeneputemudaropa.pdfIn PDF document text
    • https://mattress-leader.com/media/wofipabakuxo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bb060072---muvizarovolizorun.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58486085539.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090506502073499.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/61439866249.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/38023219847.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902105736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=you+should+update+your+android+cleanerPDF 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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 17644 bytes
SHA-256: 87202e5ff31540bae8d47b4c172c0dd01985e257717e4f01d8a45cced189caaf
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 10808 bytes
SHA-256: 3a16f28cf8424dd5787268be74b9de9fcf753ce4d5a40129d5ac610624d11bb0
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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