Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f034c3ba9545459…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 19:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1fd7f5be331b829ac5fa13661dd0ba6d SHA-1: 05cc3229397894434c2e29e869437447d3145fe8 SHA-256: 1f034c3ba9545459fbdccfce97082b862f11b12c1c7929023fbb2de3c65c841f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. The numerous embedded URLs, many pointing to WordPress sites utilizing form plugins for file uploads, suggest a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=copper+sulphate+chemical+name PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160842694d3ada---40359393900.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e36c6265---58548592054.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4e8f0566d24a134b8728f6a2c2531beb/farudotipumonufin.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9596b328---37490197360.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wonupakofebepilitokipobew.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/10293647103.pdfIn PDF document text
    • http://ruihuitax.com/files/file/39475423195.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d17c15f9---difez.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/7225470044.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/lesejodumuvogujar.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160866c1a4d29f---mebowinoxe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ec51cb23a4da747a2c6851ebf56282ea/14573572513.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502c3de661---wujibujularilanovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333123fbf9---64470618988.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vajis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960610316d8---37479855391.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/86e82b7ee28b0acb41e11689a67ba07d/51179915457.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/06b919ff42ec1436ba74e4eddb421371/9564816363.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49757af54---kovimalobimebemumabonotud.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/9fe5ddb788b5c5f0c796370c77d7d95d/goguz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ib854q0ra5me9bu1lfo67g0971/toxanafopowifejogujam.pdfIn PDF document text
    • http://gdaniec.com/upload/files/tidafowefonixanufu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d7005bc4---malob.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160721a80f3161---wanoruti.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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 10768 bytes
SHA-256: 8f0633a8203a44cc876db75a67a9df02c3221b7026b88f3d33cdfea4e8bfbe5e
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16528 bytes
SHA-256: a4030bc1566f801a313722f6ebfacaae446708eb3097ff53676da70c04a18b23

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