Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4a0105c89a4d98…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 17:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c896f1b185f5c044036b0b205de49a7 SHA-1: 5e45b04be2c25b064746249fa163e7a0db48db10 SHA-256: de4a0105c89a4d98da00bfaa76869c2257f395724cbc1d273b27f6eee4d655e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect the user to external, malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tv-sat.cz/userfiles/file/92304659638.pdf In PDF document text
    • http://artpolyclinic.com/file/files/68190125023.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89789771090.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cb1d5fa9---xusagazun.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/13455680600.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/lunatoxivufusezaxekaki.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/rukijexasilemadimamiw.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • http://ossokahve.com/upload/file/gurosigeju.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25555266722.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/504014219.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/lulakizijigab.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390f7465de3---73259821120.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/baxakudiduganemap.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/dimuxujuneforemasupese.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/lokidomudukoputivaxiv.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/62291825313.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gijekuretalajavifurikil.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/55951660342.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/56071183216.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/21013327526.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vatoxomiwodetazitepok.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61d23c63c---nivemeligikuxemefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+there+spyware+on+my+android+phonePDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10760 bytes
SHA-256: c129d3d5ccc1d996926904abc5d4deca2267f68f495da01395838e61b4b7d190
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 17784 bytes
SHA-256: 6b181ae1ddc9c838242649e05b1a2d726e44f03f112ff0eea524b72b0917cc46
font_03_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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