Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a4aeb6874e3f6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-01 23:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4896543e5df5815e3e6911ec0a8f837 SHA-1: 77281f540434998419863cbc95dceea25379e4f4 SHA-256: cb9a4aeb6874e3f6f09c9edcab2949635ac27c78a61e1f3b63cd2bea10e2d498
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d9085659---zutaxesudum.pdf In PDF document text
    • http://life-homeshop.com/asset/uploads/files/tajazorigixutejoxorisu.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/48344897344.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gatefikaxosodob.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/79946244952.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lakukeruguxajul.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33794778753.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/583e0574e8fabd84af8e2c7e72e8596e/fuvetebavimavasoremapoxe.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/kevikonepabatax.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/31484363511.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112aebfb4da7---81423060780.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/reves.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/69111652024.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2df759f47bb72337c6e8645bdd54d18e/fizuzizokinudi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a76b797ce---naredopasakugimewujum.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b023ab9de6cbfd06c20a7d828672c4f7/najedo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608660d7b4b03---33213188465.pdfIn PDF document text
    • http://allasclub.com/campannas/file/guxuwikafuzenozu.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xamugumixob.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080685485858---9286713156.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1vefvm8fbq2tmrvmrqdfmovdd5/rukowefajuzef.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607197642002d---75928505151.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/berosuvamatepin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pes+2020+ppsspp+free+downloadPDF 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 10632 bytes
SHA-256: 222882d8938d0ac995eae23374d9d57fa67cca35e9802337a2d9cf148837819b
font_01_sfnt_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 15440 bytes
SHA-256: a097a67319cac834d8f776589fd2019435b0d472a5ea1810725ee8bbcf6a59d9
font_02_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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