Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d28da6da8effd8e…

MALICIOUS

PDF

97.2 KB Created: 2021-07-08 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d56038320055a09e4fb2c249c8d1073 SHA-1: 63a9384bf6e2486e5f8d9a59c41c5dbb60301157 SHA-256: 3d28da6da8effd8e812a534af4fc250d1db0b4619d3d8f0d12a5489c5641609d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c20abb98---38017380070.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/vibagafagibekor.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb38e0ea4f---zakurefobuk.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/junejadapef.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/farejosekelapitek.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/zawewarisozogutum.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ars5v24l44mh3b5al8skgftb07/7180346714.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7c68dafe3201fc22d052a026dd4416f2/22141882464.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/jalusadulojefufifed.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210708050035.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/kurukifexid.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7267b732888d1a13f6cb838cd4ef398d/kunume.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fed002c5fd267028fe6962c21bd17f43/36393274527.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/samugubosa.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bfc66c3bd60a670d2d37d21c6321b8eb/nakoviku.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/juzigazowu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/66500245a53fdf8a0f2c22fd4a9d224e/nelegajonudut.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/18501645208.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c8d21da04fd3324036e20caa52fd998c/fikereb.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ac38a40d062887dc6f3cd773203a5f9c/58736656634.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/43763735540.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c1adc2860fe179f93d61eb574834c74/kekagusigisojadipidivob.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/45298755352.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wegeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+story+song+templatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16240 bytes
SHA-256: a3124206435378f24bee2884b1e93d6bc131e7076067fd265f94c2888dd4337a
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F46 10568 bytes
SHA-256: b5c6623ff590afae30664dd6a569764b5fc9d9a34612416faad12ef04ab4319f
font_03_sfnt_off00014764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 17536 bytes
SHA-256: 420453158ac944a33067009c30c15d770c468095ec5ad7911dc8cc95a9beec70

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