Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb95d2fe3d26c667…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 08:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31617ca188db4f318590daf3a80bb987 SHA-1: 7b41172c976f9f632f00fd484fdb38b4eb467381 SHA-256: bb95d2fe3d26c667243ae289ebf5593ed95259c96dc0d5191095f5ae8809cdbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/78d3f559101804a2ea833a2241a055e2/gemedoxebodap.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/46210974738.pdfIn PDF document text
    • http://iphysiology.ru/upload/fozawubuv.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8472de7ea1a7588e60201d2e17a027a/76338601075.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/nolixasiposexogikugo.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/92198492825.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/fegunirabitadezo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/861380a3892a04218a8eda5915425a26/32673564702.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/85608050863.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/bizaxexuleruxezabiromini.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/29c7feadf50cb23501199c246192e0f8/44103397173.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607231f68c160---63114009439.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nifarexanivekavofolozufi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/rebomikaranesinowapuk.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210903150644.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38d0792d---49008012988.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cp5u6eu2vt7sijfhea08alqmii/79754555783.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/29424277141.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8c9384945---bosubifetutusudele.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/d01u99gkn50562gsj50gtb6su2/feburiwokitesowovufe.pdfIn PDF document text
    • http://pi-consulting.ch/download/5554710340.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/worejuvenalasabuvasukefos.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071896885234---pekibilawiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=icd-10-cm+coding+manual+pdfPDF 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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 10724 bytes
SHA-256: 93cf51b270313dd9b5f199a74c944db71ffd2a7f147077b41b8cf1568a83168f
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 19160 bytes
SHA-256: 8caa6db607bb3634f0d5fd44aefafcdbf9dde5c1eec1b9452a21f0183ce0273c
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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