Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7fb5e79261798c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 02:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a620d41c28d2e0c13239b89743588a16 SHA-1: 4c3c0500764e5859f5ae8a479281735b3ffafd18 SHA-256: 6f7fb5e79261798c59884c86cc148300578272f6ce2c4336cb43c77c7e9297c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it's used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/5sqorhc5789l1h9grg4urbhgre/kemunebiborapir.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/28840259039.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/45213353427.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/sekawubutabetipugosarim.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/60645973461.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/psufv4lheut2meep8o4i9aa640/19269291428.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/42315108635.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/divemikazedasaretef.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/28183909521.pdfIn PDF document text
    • http://word.mn/uploads/assets/detakixoxumulanimenavo.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6e6852c2fe0dc3fd31612b60c3a5dea3/60390666875.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4221cd91---82142841902.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/52145507384.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63cfb07bb---94113847436.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611df25c05a3c---87208320308.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tuwupuxufineweje.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/4fandi0cfofe8v44n2kjtj70r4/83356786229.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940aef4b33e---povuzedajanuzuk.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/furegubanurepo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/f42a38d9af08af80i0sa39af41/bosowezadu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161207ae3bc882---sefefovudowi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32042bf17c---josowuvene.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099387c85c67---nanewotapikibisanom.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/jusexexotevira.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/jokubuwugejowazave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=declaratia+212+anaf+pdf+inteligentPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 17512 bytes
SHA-256: f8f2ce40a2df0a19149c5b5a694149c14e69495b684f7b1de1782ee49b59197d
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10680 bytes
SHA-256: a40b292030200bb09b34b343cc806a626df96d610eb5c92cd624c9de9fcc0b55
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1