Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c4ab7d338d4523…

MALICIOUS

PDF

95.0 KB Created: 2021-07-07 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2397940b914fe2a432d769dcb892333f SHA-1: d1725369aafa5a370766c9578accd25610fc7ea0 SHA-256: 91c4ab7d338d452362f1f5d44e7b56a28a549d72cb8949ba24b07eb0a5fb9070
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084877da366b---napaw.pdf In PDF document text
    • http://gumberryoleschool.com/clients/33891/File/roladez.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kipivukafakazeziwo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jfmcsqf0ka8b37011rqgnfj8ol/83776707966.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/92526489081.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tikuminugope.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/u8m8a7jcmq9tjkh0pnv1htp0h1/lixobedemufanuti.pdfIn PDF document text
    • http://premium-h.info/files/files/mepowo.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/basuligegeb.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f8a2c692---78849628406.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/30222267375.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/pezezegixorobi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/he80nvs7lc5rc2ga1vo0kmrq31/zufijabitoruxuxilize.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/326be9132ff1b28b7147edac8041eec1/lewarefipemopegugupev.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3d203c7bb68516d6797d249a1679183/dakamozif.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/juvigakixuke.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/titaxawanise.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/niziwozabup.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ee12d79d---rikafadugilusupi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pesowidazolozedajib.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e4193d1c---wafira.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/nokujinovazojavanono.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a4414b68---28898041748.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a496194eec1---99840757605.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aa5a18be---depalesixopibamabo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061323561623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=new+hd+sexiPDF 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_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 17552 bytes
SHA-256: bb9f9f7cff413dd9fef655515a14cdbdc2e667b862531bae0685d61784359f15
font_01_sfnt_off000140f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 9880 bytes
SHA-256: 21a5ad4cba9d6f1845e6adc760abb230ff5ea83c608166856c2991352345152a
font_02_sfnt_off000156e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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