Malicious PDF — malware analysis report

Static analysis result for SHA-256 5becf8ca38350972…

MALICIOUS

PDF

175.9 KB Created: 2021-08-09 07:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abe22a2262e9c8531753370bd23d97b9 SHA-1: 2dc5b83690e17aedcbbfe25a1287f34de2b68eda SHA-256: 5becf8ca38350972343af939d23820b0f33e442994d22987803d15fdb87f1557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://anhbanglaw.com/userfiles/file/49016991397.pdf In PDF document text
    • https://www.alapan.org/fckimages/file/kanotaduvuxaxoso.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/64dc3e58806b1808ba6a4990ece3fa2d/gutatabe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607628bb5f420---40543692514.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2bced4ef02dcea24aa8d17f3ce40a88c/vetusipipuwora.pdfIn PDF document text
    • http://ipllaser.in/uploads/loradaniwasoxodobu.pdfIn PDF document text
    • https://atl-50.com/files/file/tokatovepe.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsdg3rn14i74f958kqqkabjiua/vorififududeforomu.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/tanemisurodi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bpnnq9lve5ll1h6kdjtho5p0mj/6062333717.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9a78b24e---xusegusasol.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2252db2393---8979110491.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b1e8a2fc---gefizomubotijekujatoxiwaw.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b996c6b4c8763004a1462a9de5bcf19b/43954066581.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/24373985369.pdfIn PDF document text
    • http://seamacros.com/upload/file/4914279201.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0cf506b1---67971663742.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fqmdklb6imk22sisdbh9fl5k2/14666665650.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/66215109539.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/selitegofavoduluwipup.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/69181444330.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/fuwezaxanorivenadosiwamo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081760bbea6b---dipudaxefosodupijarazel.pdfIn PDF document text
    • http://edgecs.net/documents/89494851204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pietro+bembo+asolani+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_off00024ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CE7 10800 bytes
SHA-256: 092529ba0b63638ca844650fad910577cc39f2f287b42ce62702af8c6fefe21e
font_01_sfnt_off00026582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26582 21512 bytes
SHA-256: 561162e320d5a784616637c8e87da93cc80a2dd935f7264fa406ef401ce19c5c
font_02_sfnt_off000298c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x298C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1