Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64ad08a952b8688…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 09:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 894df68a963075cb69d99df1a289cba9 SHA-1: ef092a2d1567fe0a2685b1383188471843f2ad5f SHA-256: b64ad08a952b8688999ad91663fc7c7c6017eade1f60fbf0dd046d67d3d43703
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it directs users to malicious sites. The presence of numerous unknown URLs further supports its role as a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4663b22208---bejedesuk.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/zuwikejavamev.pdfIn PDF document text
    • http://bwc.lt/i/rozodizerelaf.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/77084832950.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/27679505325.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/37305771950.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c284f02cea---sazage.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612094951099e---7878661832.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/dinomoduwupatewabopokowu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/86220397090.pdfIn PDF document text
    • https://buyout8.com/asset/uploads/files/mutifuzufipun.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/99127641102.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lorajoxufikikajira.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/45241671935.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/wasitobudaw.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/luluwiraremozanifiroxupal.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/88707727037.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/49c920bce0435eb181f2bc50fcd10175/rexumozikusonobel.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lowiwe.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021619141225.pdfIn PDF document text
    • http://naucseto.cz/storage/gewizewefusa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160982efb79d19---69487033073.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/kenejaxe.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/4391167371.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3erongerluopdkh4hsut243kp1/mukejuzudenidifalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manual+de+procedimientos+administrativos+peruPDF 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 16024 bytes
SHA-256: bd45237ddf4acb6bf2df232c188901a79e08a81375aee7ee6f40b87ea22f567c
font_01_sfnt_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 10836 bytes
SHA-256: b5c5072cccd928ebcd875c1105c166620ac01f78c4e0adb2e1e31bc38389744c
font_02_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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