Malicious PDF — malware analysis report

Static analysis result for SHA-256 3746bd3fd3de52c0…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 13:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32bae78363132b6a586d5567fad67e62 SHA-1: b5e4dd6fd63c6ecf3ceec3cf76b1c102f25b6554 SHA-256: 3746bd3fd3de52c0cac7f7c8c03331a453c1235cf56d65dcebcbab23d62237a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=convert+5mm+to+imperial PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160926abd2ac1a---jowewovarisisokapisi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6q4o6tliaq3actapmo5i0ljnf6/lesukoxujitamijexa.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/74467317858.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d71e69c4dc8---pazaxosufuwinebetififone.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0ef55200f2fa201912046ab4290323e3/58046589593.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/bamemimasokifadexoxopi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ac2fdbebf9c6d7b83b05e902e03c9a8b/81705287898.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef5e17b06---79516280845.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/0bbc66dcef7318b3cda49cb4d4def3eb/bunog.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b917210c7af---86302201685.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a5e655fa12bdc9cdf63205e40be8f34/galegumaxam.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/q0te0lts15pme49rcreuidilq0/xopowefufipaziva.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160841636ccd1b---73125641088.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901faef3e02---26721752625.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b6d98a3b---5782770777.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/tutesagov.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/sogigameragidejux.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/738017282.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa429119cad---81818959580.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/15351940409.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/raterepobexej.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a8653809---53579221599.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/311431a6b30c131e22147be90ec65664/dekafubasujunisa.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ojjs67go0ql7ogihscgdor8k3f/wudododazipeginenoj.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d5b0e0ce---43711826606.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3a2b36cfbc59d47991c2cb3414bc6ed9/56631016609.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10476 bytes
SHA-256: 3718ee370d9e067396b2511da6c4e851cbfb6b9b4c1a77749847ff7396a399e5
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 17340 bytes
SHA-256: 1de75aa8a37e8ec8d362f5abc77989b085b7927af2a81c97c580c8d650e72185
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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