Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85f3b86b429bf9…

MALICIOUS

PDF

92.0 KB Created: 2021-07-04 13:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8eb0c54d193d3cb612738398e3ae7828 SHA-1: 595c19aa88917b6e928b43a06dd6d80b3883fc5d SHA-256: 4b85f3b86b429bf9fc98bb8568dd2e7676aa679ccdcfadb8c110f490bd6e3064
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it is part of a phishing campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=equitable+life+and+casualty PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609799fd7dd21---lesuniredijenaduvi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd6d31bafc---14125074001.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/58042098909.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cdeeafce5---82632059871.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/tegekatoxaxuwividajiro.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607881187e94d---desorosebuwadefetaxagewu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/238fed48fc7fd1e28fa51c3e53338471/pejoxexepinobif.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/96648242876.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a33f4b86b---71732811660.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/56ssrlv0d0d9huf5q6fbkpfbl4/talumerebopigorizena.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7pahh0r3mtdukttsr1brff5nfr/nimaxolere.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5901177ef5---mudegimobawuvi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pubofo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608786dd9cb2a---somimizegojir.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/58464746721.pdfIn PDF document text
    • https://bio86.net/fichiers/47681568168.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/sedofaveteterifunulevuga.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dibowafuv.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/pisezox.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c585a4ce51c---17232048650.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/tudimipezolaverar.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/dofunugijo.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/60719965630.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_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10732 bytes
SHA-256: 40650e55c811c5abbcd8f5a2a02c9c368d05c0ae894f5bc969b34b650f27f8be
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 17588 bytes
SHA-256: df7a45338da8176fc85fdc2d0644daf5fb43464a569422257520d12fa958cbff
font_02_sfnt_off00014ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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