Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6c0721f190f36e…

MALICIOUS

PDF

103.7 KB Created: 2021-07-03 23:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8fb447fc22a08835f4d6ba8e35042344 SHA-1: 2fe586f08a9072db04134c3bd42e28ce55e87c7f SHA-256: ad6c0721f190f36e70470806f7711dd2a449ee0ceb258ed52296cfe52cfcedb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 6

  • 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.
  • 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://nadinerogger.ch/userfiles/files/70289606498.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf73fb9fd9---27189211466.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ae7su9eansdlrb7j3dnm5n08qf/21439292183.pdfIn PDF document text
    • http://quaint-house.com/sowide.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sazagi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/5969638846.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ab1a0862bec1c4d8d95d558e3b2c5392/72994935475.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a434e54ac21---navosulazilujetad.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5ead9e25---pibusumedikomopiridowime.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ed694144badda0caaf96a29a08551b4/16385697008.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/51699507172.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d9d41d0933e4870d83e3b21b4a67f622/muzozepedebolagibipu.pdfIn PDF document text
    • http://beiks.info/public/file/85472715712.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b597ab8ef---6033025187.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/gajilu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rbs4fhq8oiricvjhvr3ngu2su2/65312637279.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd61067b0---46786317177.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/l3ng0l17dv76q8qmm5nsl7qvb4/42001659926.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vimunowojatuketoj.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5f626653abae9f227580c3b2b004699/99375246504.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/63543275166.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9o5so25u7k8npklk5gdjusdkr1/xuxuzematogegedesojov.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c2e699ec4a57d15b6017959d817d41f9/jotabanawidekagowaxupug.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/rupuwejijabifem.pdfIn PDF document text
    • https://85097781.com/upload/files/kataxoxapote.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a04d0a33e---dezupasiwinizojelotix.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nfu4ks1v8bscko23kgoko3lm9t/88256307645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=poverty+in+poor+countriesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000140dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x140DD 19588 bytes
SHA-256: 814820d96fcfc80dcec25e400d4429ab8ea1c20ae796cdd6b1bc3fe08206f705
font_00_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 19064 bytes
SHA-256: 3b422557dafd35c6cc7a0b6b8da6cfadfa421c9c5d13743e0ab9785777504a2e
font_02_sfnt_off000160ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17901 10440 bytes
SHA-256: c77f59ffbcf2bb3ca31864ac58ba2bb730abc54a4867ab1683ae243fd117c3d8

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