Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9be88da696a91b2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 00:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3aed8281357c4fb0dd46ad78915d8b85 SHA-1: 3feed3a92bf0cf684e2ab022ffaa03ab9f53cc35 SHA-256: f9be88da696a91b216edf9ac6a92abf60fdc4801e1d3d27fc75b97fb5403722c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a PDF document by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=reality+transurfing+pdf+free+download PDF link annotation
    • https://milosislandrooms.gr/userfiles/file/29368404486.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0b29abda---nagip.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/2290113017.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f927164f2c---9319928751.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/tiwemazeput.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/38dg4f5nmpcn2rdqgra985qaiv/29538076513.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a1fcd212---zijikukubovapazas.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/19105534327.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bed407cef99---81537178687.pdfIn PDF document text
    • https://eternalbliss.net/file/dasozevopakajigekesiwo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210809_A42C01370A73AD4C.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/61481269157.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/31165644694.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/70f0deb11967cc447ac0c83681a94967/75148310036.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/pebika.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f58727e6ea0b3dd60799413bbdebbbf2/56721043591.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/vexuzixawelupugoxofuriwe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cceaa90607---lozitunufos.pdfIn PDF document text
    • https://carlojans.com/cms/file/86721165745.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/12425897274.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/zezakobi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/03394d932df234450d9e00b75320bc6a/zukujemu.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210707_815047DB151BE01B.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/56001834880.pdfIn PDF document text
    • http://webs123.com/userfiles/file/21610122694.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 17980 bytes
SHA-256: 4c4917b21551a82b678d0956f61c236e2dc2a6e353989c8c488c4d54f10aeecc

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