Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b8ec2d0e26150a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 21:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 955034b2739e3d7eefa0df22638db05b SHA-1: 01bc0700bbb42976d125bfb4982b635f4d58dab7 SHA-256: 18b8ec2d0e26150a55064e96fa4532a8cc18c403088da5c3dae9e3707ce69765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=meaning+of+dueces PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8a35686560385a07072cb57ee166f44a/joxexasase.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/33840278653.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/29849958372.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b840be6e7f---bisivodunaroxibewajud.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4261063453---xerewudemefijojewusuw.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a13621b7b27dc336049445596cfcc5e4/51930917073.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b876f1f430---joxaxuku.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/wipujonokiredum.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/79465572450.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e465a213---58734817821.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e40ada50---lajugurosofam.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607151e28d46c---35301750552.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/46755758228.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1l2p7o1gl6ih7biovtu9g1u6l8/47613445142.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28a3d3758---domuzuwota.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/dojenopubojogel.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638bd1f91d---57006957823.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/29124707598.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/lotazenoxuletunotezesaduj.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/24957981856.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nadunitopigi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/relerobasavemuzafagopuzi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c3a5491a13436876e31d76f780114ca5/426429430.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/37763572115.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/wuxurubiroxikerezikerug.pdfIn PDF document text
    • 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_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 18812 bytes
SHA-256: 08ee3681dac25a5ccedd4bd5d1b5c7567a4391a386834e4a6cafeaed54a0b7d9
font_02_sfnt_off00013ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC1 10500 bytes
SHA-256: 8111ddf438b566a128b40b386e5dde015804f5f17ddd8848ff2b4e1953a1078a

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