Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5991e177c01e485…

MALICIOUS

PDF

82.3 KB Created: 2021-08-24 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08e763d1a04242bf12c7e7347e345962 SHA-1: 89b1de14846fed577a412d39e49be238b9a7c15f SHA-256: d5991e177c01e48577b4e6c3e1587135af67599427197e205d3b4d4b26a8cd8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://catamma.ru/uplcv?utm_term=how+to+hide+screenshot+on+snapchat PDF link annotation
    • https://gaziemirkentkonseyi.com/upload/files/zopajekutalilipituwikofag.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa42d8282---loronibaki.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p2o5ic6ffapa5tem7fd38rjbdn/78600745863.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/pubilugo.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96311869354.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/merabofetusoriwenejir.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160872d874bf07---xufedapek.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0987bbb1b---werojonagisow.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c2r617hfr1g5ue5htdab80l2ee/10910073080.pdfIn PDF document text
    • http://stevis.cz/files/file/47467678087.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d1e3f0bad703f7f176ddf2cdfd4ff76e/71896353918.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///wodixel.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e7d4b28e3---guvugukemineniladukutaw.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/webebotenitikitumed.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/nelobesuwedogosudob.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/78409190080.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1b3bf156e5d1bb890f40ef1ba73d0aef/7743506626.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee57e318---94834526797.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/wunenigosowadilimoba.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/44158016907.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/32836222331.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/20910870934.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/lifadovivibepixivotekoma.pdfIn PDF document text
    • 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10644 bytes
SHA-256: 46d5567dd732ca3ef47deff550ea2dad5027a2b4f8880ad3128c3b9b3266c5af
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16640 bytes
SHA-256: 2602b178a9c256275ce6d4d176882f14138bf08c0de8fb834b24ddedd9019181
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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