Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db824ff98ccbe54…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 01:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 267a5dc4ae94416c85aa88087c147709 SHA-1: 916423aa35866201a2c518863987012f4b093bbb SHA-256: 0db824ff98ccbe542314a81174ad9f6935206c0a9f713da43c7409978c2781a0
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains and compromised WordPress upload storage. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kadh.kr/bobod/upload/file/nivukokumajamokarub.pdf In PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/8617851883.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/rekotivosabofur.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/bokuburigopi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nudexeferorufoze.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/jinubulelas.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/nemexawuvaj.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/finevulefolubivemilufu.pdfIn PDF document text
    • https://stopserv.ru/files/file/xidafusakekopudoxuvewaxav.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161450453b18a0---xanusenawaladiduxasufore.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/dakogutefaxiraxefe.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/fuzumenunuguvafetojipi.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nutemopifetarifudosuzo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/koxibosivekopoked.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/38316030733.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/50e1c89b8c2e0fa0ee70cbe7f23c4841/87652519273.pdfIn PDF document text
    • https://digireg.es/upload/35535656061.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/rufowelitejomu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25769057436.pdfIn PDF document text
    • http://afro-safari.com/upload/files/54362938038.pdfIn PDF document text
    • https://revive.fashion/upload/files/78604930692.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/48226192877.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/88914408481.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142699f78de7---bagodavirarufinovabitelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+uninstall+an+app+on+my+androidPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 10712 bytes
SHA-256: 995005a25aad50abac303d67afff6aebc369c2bf4738474b25882483687cdff8
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 17248 bytes
SHA-256: 79d2d3be684c18bc76c062b2a466c7a13a2e5115fcdf98a9f58478aa5e379d1e
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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