Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ad9b91ec0462b2…

MALICIOUS

PDF

104.5 KB Created: 2021-07-04 22:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49ae57c8c5266286853d1891840bdeaa SHA-1: 172b6009ed0ba173ea0d1f478466cbcc868128dc SHA-256: 18ad9b91ec0462b2accbfeb8ec7527f56f081069bfcacc0b3f335a4193f8d99c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing document to trick users into initiating contact via phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=also+called+as+degreasers PDF link annotation
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f23495c45---11385644527.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba17e1f9b---kadokusukoxebupasuz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/029dd7286014e4622d85ebef5c189a6f/77150151283.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/54550524783.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ecefed5c23a2e71c5670aa9bdf285332/24765790403.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dcc33789---remusafukusek.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/99227498650.pdfIn PDF document text
    • http://jngf.cn/files/file/vupujibodofuro.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/32573202855.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9059723c9f---giduwerewamedofumodopefar.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/89134542121.pdfIn PDF document text
    • http://ymmicro.com/files/files/wixepidor.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/ketafixitisemuboviw.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b2ab33c4a25d5f0907fc5026c1f50fc5/47851629674.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/33bbeaf97e98c486dea49cb919d28969/99427509837.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301b20bb---74905064534.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55d5bc528---jaxog.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7d08590c264f08e2d6e76f2de57d6d7c/25371324851.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/gefexikogoruworebudum.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/8364179446.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/78403436799.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/9353316694.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a26fa8a---xutidujeb.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608de18089e6b---70411503994.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/filinuzoziziwipeziwimun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 18044 bytes
SHA-256: b585c2ef1b3ed617bb1c7edb4cda983e25ff315ce87c0b549fb7b6825c44aa2e
font_01_sfnt_off0001498e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 10232 bytes
SHA-256: 7926a5a0c443ad9cd6b46cc0b60efe869b8cd28efd79bfb58b2ea637325cc8e4
font_02_sfnt_off00016072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16072 17512 bytes
SHA-256: 6d2658e03a56f9fde0867ca4d779dddbf99b2ca7bf447a8d6dbf92194fe2dd8b
font_03_sfnt_off00017a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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