Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0994f1a044d6288…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 01:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28715f892c184e97595825ed8b042463 SHA-1: 0fad52c32d22f7d33b77d2701f2dae16617895c3 SHA-256: f0994f1a044d62880cf0a51e0a2ffb4884fc1379a2f28c7f7ac581ebb031536e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://canvangdientu.com/images/file/36445001243.pdf In PDF document text
    • http://osmed.cz/app/webroot/files/files/81223382766.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24447d1f28864fa10310f0cd78d9a5c4/wujozodof.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/bilomugoge.pdfIn PDF document text
    • http://17njl.com/userfiles/files/pivuvolusolefimepefedot.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/84271401622.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/texuvetefowapilofuz.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/rodisepisaworovupal.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/69097396003.pdfIn PDF document text
    • https://actorconseil.com/files/file/11172267715.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fipalaz.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/e78b0ttvdo383uk5k49a1urg9c/riratubivudunanidoju.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/ketar.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/shtnin1gamm3pq7dj2q4rrahrq/33917372931.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/73432185490.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/66114447307.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/molaredo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba23a8545---gisuzexamonoje.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/bupenad.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/xobetudoxowidedudifexewo.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/76317948392.pdfIn PDF document text
    • http://arablift.net/userfiles/file/wetifixezuleramuguzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=slope+and+deflection+of+cantilever+beam+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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 10896 bytes
SHA-256: 59a19a3dd65fdbd69400906383ac745ebd3208597c7a8cb388a156c5ec54ca4c
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 17180 bytes
SHA-256: 79e1bc9da93fd56be63e51d394c69271ec9e35e01efddc899f4fe319f436f266

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