Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a555afd761ac7f…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 20:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d73e4ffd6e1f6032d1f54552720c06f8 SHA-1: 56f8bd36620b4fcb9ef132081e20465d39939065 SHA-256: 85a555afd761ac7fc20658bbbac74ce7ddead2f5f270498247c1278bea3cbe1f
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick the user into running a command, likely to download and execute a secondary payload. Multiple URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5249279af0ac3c4fc70ffba4e4ed73af/52358836849.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/lezoxifokesegotafake.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e34e7d558069233745473730030561eb/kusaritesaridaneberoxijo.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/69559360558.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f5b02a5f377c3fb3c8c2e314483880f7/terodapirikovuwemuwus.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/84qmo80v627kl4bc4327diptii/vubavalorewew.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db5fbaeb9---78860769124.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/22129493392.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/07tvelvge90hnlknsmekpr0olb/21739718742.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/dobarumarejogufiwaw.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vofevarutu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c66f48503---likexesorujezugipa.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/47432642292.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/jupuduluvoju.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/88376898333.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/11668621873.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/xinegulufakesiba.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c0c3f08c57bbe3a4eeb5b461e910ebf4/42858920763.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33cd85429---84269498504.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/818e5af949c08f800aa9fb485d664d49/tatirosawosolono.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f7cbd2e8247ff1d1ad077ff64361e416/zadewibosafotozaruvejoxif.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/40379110045.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b724359d92f2a206ec4563c41f6a6d07/waguwef.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d4a178c7b77b196fa24eebe8bda77781/volazetaj.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0933faa5---44111009367.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf6329c1f---70262712846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spore+cd+key+codePDF 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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 10116 bytes
SHA-256: 4fed1665be3bb80945b314689ba238cf5975b8add4fc8d73e4194044f637a4ef
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 17136 bytes
SHA-256: 0b47eb6d22a73c7614dfa37d52b8e1bab2b588727882e7d9f69ac3f5ad7bfcc7

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