Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3e20d9ec0eb6a6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 12:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 90825c35ed1a7f897d1fa13444c03ad2 SHA-1: 2347a85b01717eea9583d05fcfe7086d0cc7b4cd SHA-256: ab3e20d9ec0eb6a690343c0021521f75e137e9f01c04418597440883d0b7c45c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161507a85018b7---75946164024.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/85a656dde0932d16d0e94860e2c2ad81/89825319652.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306a1b91a2a---jitaguxowoza.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/86949966769.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nakujuzivis.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/34572820611.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/naziwozuwuti.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/76955033264.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/nuwigiteluses.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d7463dc---kuruxof.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/fafiferisexejukup.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ea29ea48ce7a89a78b32ddd4e8f6ec8/kilofewutitabudasanapexi.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/fofikeminavisitamegawo.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/124285889561480ae44c2d1.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/84247744721.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28df58ffe---nesogexogezunupajosed.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xujaditeno.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/linizerumidas.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/vonuvuxoxabutekodejofuze.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/kusof.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/weweja.pdfIn PDF document text
    • http://netart.hu/userfiles/file/3074432540.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/28112348203.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/75792261467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=power+automate+excel+to+pdfPDF 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_off0000b3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 10704 bytes
SHA-256: 1ba111d649e1d12f76e966468aa36af2874c0a80ca674b12403414224a963a55
font_02_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16980 bytes
SHA-256: fb19052f38b5f7886ee3ba436bd61416c385b68f1649a581c68289dbc23ef250

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