Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3a406a66a35bab…

MALICIOUS

PDF

80.0 KB Created: 2021-06-27 13:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 019885021784c42a39e883de319c2f8d SHA-1: f1ea90179ef30abf927bd416f9ccb8cf53e61e05 SHA-256: 4f3a406a66a35bab201e615d3dea92bf56fadb540b6cb2fd7e69cab7bc851ead
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, with one prominent URL impersonating Microsoft to lure users. The primary intent appears to be credential phishing or delivering a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=how+to+get+into+windows+10+without+password.
  • 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 https://oniceh.ru/uplcv?utm_term=how+to+get+into+windows+10+without+password PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9e8a52f6---51236050761.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608111704f01d---magageme.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56f2d4d3b0dbebdbffbcdaaa5330ba31/lavigexiputegilejefuva.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/wovate.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/45654406846.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44593e72a---37336383932.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15562723066.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9ab727c18b7c6de1b64fd5517a8a3754/21895186972.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1m6fqjj171ugf3e7ihcmk4lakb/37081708747.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990c4fbbd25---jisijovusiviv.pdfIn PDF document text
    • http://temple.mo/userfiles/file/44208860530.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/730aec9928d99a07f722ab33ecf805a4/58869749740.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13277bbde4---gesasurimopor.pdfIn PDF document text
    • http://ekotronic.eu/files/file/38347868534.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd484b23144---kojajunotoponitaboziw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3740ec667---78799800675.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/343f9d5ad82290dc88133ff0dd0c79c3/wopadeximevunokipebix.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c679d212515---tesigoxusonaxiweroleluxev.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ov4cbi26fl6r0lurr1is514lpk/jegewasimul.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/38524820809.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/13548261788.pdfIn PDF document text
    • https://latework.cz/soubory/wotarezipuxop.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8c822706a43cef36f92ffcfe070f8b4f/32121260830.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/54301273645.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/surujijuxajisawamew.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/57661755842.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/2gdmuo0lrmn9defug7lu1eopc7/jawenasexaloxaro.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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 10976 bytes
SHA-256: 4c85d1656db4370debcf8e503c7687c9736402c42b026ed87ff9c188399999e0
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16452 bytes
SHA-256: 42c36a45c148b48c017a9978e8717e41b6b1e799ec6fcd20d842e48ad3a96df7

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