Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e939f5df6ae720…

MALICIOUS

PDF

89.7 KB Created: 2021-08-07 04:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e83e458dc598be82b402e48d5602d98b SHA-1: e40a9d86385210ae38c4fe960cb3afc5b18b4551 SHA-256: c1e939f5df6ae7203b5e9e3e35b5c1f9ba994d9753ba57cbbcfd7a9548142db1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages, a common tactic for initial access via spearphishing attachments. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://elpollopaulino.com/cenavarra_userfiles/files/70525589612.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lg7t1pd83ksmlf0u7tmr5dukk1/libimagatizu.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/78316111754.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c915a94284---5068244927.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vpj37np35ss474gu8nb2kgkkfq/pevizuwiveninatasidilanuz.pdfIn PDF document text
    • http://gyobel.itpublic/file/zimalulowefodawexedobutaf.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e6656d8f---91305396647.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d28a35240---70529989690.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a8c0c836---kuxolim.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/27138297741.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jukijidezeviwijutudin.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dddde773e4d---66808932434.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/tuvaromevaduxegimap.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8cff52d8c88eb1573abbd849c55bdc5d/xalesataw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2a4b7b86---lutatulurotetunosafafigar.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nevofurar.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/10389797239.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/55636185882.pdfIn PDF document text
    • http://araonline.hu/uploads/file/dizubogej.pdfIn PDF document text
    • http://dhf-china.com/d/files/62576984745.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/nefefobi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69f2c59c4877f1a3fa9e9d0b0f6ba7de/5821539771.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/77440988432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=je+peux+voir+in+french+translationPDF 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_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 18868 bytes
SHA-256: 28925b6a58063481e7c72600e60208c0e0457e7638bc727b4b6d0375f50720f9
font_01_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 10836 bytes
SHA-256: 3921cdfb7ba6f6c447fda2f8fb4bb40838dabce969f5ece70f213605dc0a0815
font_02_sfnt_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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