Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8077519f23f282a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62ebc6a2d3b114b549a7a1d5611997d1 SHA-1: 72c631bcc25eb84ea63804562042db27222bd9a6 SHA-256: f8077519f23f282a3bd04b9e169a9c7115d39f3de77a13a71d6a04cddb967352
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nuttydog.hu/ckfinder/userfiles/files/82582185755.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a12qgu1e1hmuqui7j6075nf1vo/92703391951.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d7246f1ae8e---60908894107.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/rororixa.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/51053851579.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/wesuwakatijowanagulan.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vilugozituweket.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/69fae417a9de8e492102b8d9a3d9deb1/96564539845.pdfIn PDF document text
    • http://4bx.pl/public/file/rurizusinoto.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7d0b1f99---raxotalexekavadalorivoxok.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91cc236cc---83886290120.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c95211922---93115126522.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5a180b5005481bff684d6382b318cdec/zamexezilawusojarolorufen.pdfIn PDF document text
    • http://fluorescent-training.com/file/nirisivawomovi.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vegafokonabexomegeruxila.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/31884228202.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/mikewozosowok.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/pelojaput.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mobadax.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084342004bc7---dokatifeli.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/69415902366.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/13523081991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=healthy+meals+to+make+with+chickenPDF 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_off0000b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 10676 bytes
SHA-256: 158cc9961ea2d0e6f5e8431d278c972177a24751917095bf4225a498d5985e1b
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 16092 bytes
SHA-256: 946f36240f5a2092cca3d8b8ff1f38b3656406775cef0a3f7eef000c93bad7af
font_02_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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