Malicious PDF — malware analysis report

Static analysis result for SHA-256 79239e430f3812db…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 13:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 335b21958bccd6548aede6941f0b905d SHA-1: 4e131f215f269b857a5b15f58231df6125af1270 SHA-256: 79239e430f3812dbe7d2e2e46a2e6bdf4a2c5e960fac8c2a143bddc86b36ce2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting it's designed to redirect users to malicious content. The presence of numerous external URIs and a link farm on disposable hosting further supports its role as a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=lego+seaplane+manual PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103b47893f1a---26805527933.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d960aa2f49---gapegogeketabavoba.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68297b666---12343107870.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cadd0060a932f02f12e38d729206269e/21131457299.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/48969607707.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/44tbvg5oi33kjme2e961mdbc77/26527868914.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/vomogewobuloxepedonap.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/88889341680.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/suxutoketewa.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tobitaberopipomaranep.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mukuf.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/91447608029.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f175abed---lavilulamitigudanojaw.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/revutixasotuvolivuzupal.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/xosilividir.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d6a0667ba75dda5804ac1197bccbad8/29431504482.pdfIn PDF document text
    • http://vtaky.sk/media/file/88443297138.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f734d29630---59612072377.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/biguwepuguvuwimugakiw.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/69093020993.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/lofukosinale.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa73a239a9b---merijakidulapewuz.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/xinilogame.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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 10360 bytes
SHA-256: 2dacc95c18926ff7f629b0e7c46bc00633fa2fd8e628615fc664641016305af4
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 18736 bytes
SHA-256: cd434651a06b27d566602fbff5965da5647412e541e3ba2859ac874866c44f78

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