Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c3dd8531fdaccf…

MALICIOUS

PDF

92.7 KB Created: 2021-07-04 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0147c4e368f34bc497f41349d35f3e7c SHA-1: 204b1c13d569747f05344e4ba6bffe7ea8ad7a9f SHA-256: a5c3dd8531fdaccf7c8584113523f2729144064431f4840ccdc6297caac048d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=russian+squat+routine PDF link annotation
    • http://ahlhy.com/uploads/file/290851338761.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf1e9ba77---fukoxisapekuremametijuvo.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/9529100322.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/olvehjf8nh3kkunfm09cciaji7/gixemok.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/96033197119.pdfIn PDF document text
    • http://mqskin.com/luutru/files/3945281502.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/zexetinerisegimonaxow.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5510fecdee---12173233383.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/punubepobatixanaxuterir.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/53a3c88069eb37d7a04b471f99db914f/89712739069.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3c6c972e---97446823296.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1048abcb76d2b3587e2de76a750f1805/zojukilovirexuwakoseju.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/17325191068.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/59688617616.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jipezoxefogexe.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/wetofosetiguwu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af0188273de---55780059799.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/semovezinavigajamekufonaj.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939c35cb50---jufejazu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d89c4b55---54591832938.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/3cebfaf2de08a893f2bead99d5f73bda/12630310172.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3d1301a435c1b71d6745485db4445b61/madokoposijaja.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/43addc540dcdef9c8db5a172ae0bf365/60700732059.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae94042be---bakevabaxurupudotokizak.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_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 10344 bytes
SHA-256: a8fbcd8f521f5e525c922fd21fd91e7630814827e2fe6d3b87450b4525d2bfc2
font_01_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D6 17328 bytes
SHA-256: f0abc20500958a6ef51cd0888b93c70d8536ffb8a437dba274a49b459f6b0281

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