Malicious PDF — malware analysis report

Static analysis result for SHA-256 904f7bda35f97af8…

MALICIOUS

PDF

121.9 KB Created: 2021-08-02 16:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6c4748c21609340414086c632837dd0 SHA-1: cb618ca6129c0a312a408902492afe99e054f90c SHA-256: 904f7bda35f97af83e42e06a309f8373c520e9d089a5ac3ad251cf52353ab807
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dc9753b642b2cb58546e3483c4572d77/2268070343.pdf In PDF document text
    • http://nensi.si/upload/file/vurelum.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100ebd9143b0---sorizategupinameja.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gejelanotalixetapufafawe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25ffc348c---todutavozasusakutusob.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dee8cfe68bf---rigedabafunepunekiro.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/envegsm3t8u1clggg5lmb0tu8f/80473050845.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7l1hkv4tp6q9a702knmhhfcna5/gefusobenokojexax.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/55598436604.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/75119547985.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jugakavi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ff8977a9b1e6180af39da0ef488b3354/mogapogazifajegomamag.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f9ca0073b51e5a3a206830ddb8d65b88/lipujuvikosupodesixol.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f1571973---680791588.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0km3f0r796hsa8t0msaq2gegbb/sopigupidogaletobajakuki.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/30849701690.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/90543094331.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/02507342c17d1c90dce7fcabafaeeceb/donewilo.pdfIn PDF document text
    • http://geose.ru/userfiles/file/mekozefometewasenos.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16100aa6814061---xubidawapisiwetimo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16107dd1da23e3---vovopematozozexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+multiplayer+vr+games+oculus+questPDF 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_off00017998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17998 11092 bytes
SHA-256: a8643420f7a73c5958c3e163883b7b4334dafb69f722cfca63d89c712d634b96
font_01_sfnt_off00019341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB53 17416 bytes
SHA-256: 1523d8ac4796468917217c99bc29f6c21ecfd0dcc1d8b0423885d9b3466a7591

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