Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f95ac3440283e6…

MALICIOUS

PDF

100.1 KB Created: 2021-07-02 05:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9fc5eba02c08aafcbf637a2857c716cb SHA-1: 9089b60fbe581524a565d00240940b84039fc628 SHA-256: 33f95ac3440283e62ea8a579ce1dd0ada2925f8d4334594bb07b41d73f2b89bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/af3a6eed5492aa41f0059ac5e270307c/68214644556.pdf In PDF document text
    • http://eko-inwest.eu/upload/file/duzatezujevokaseritof.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/nakukutesosexamixusawav.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/70d923558806a6cb7c75269a8b03ead5/pipuk.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1f47c0bbb31c4421def7d2ee7fe9fdb7/69676400614.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/1650025367.pdfIn PDF document text
    • https://artenika.pl/fck/file/tabijubi.pdfIn PDF document text
    • http://giga.sk/storage/file/50724340799.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9f19938---57399862148.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/96bbdf6bf8daaeaaf7e4644540fd7356/luganixirumunavubawoduk.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41979cfed---54281936335.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098369ab5d4a---83269931924.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d37e70fdd---31823025173.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/613bda2b618ae55e738a970ab2887c60/ruwabawibunufonidev.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c1e17a0070c0f9b2b0af1308e42d4a99/67690844074.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fugapuwov.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e3b0d50c---53574168925.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/depabilu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35aba2716b---42056834420.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489262cc8d---33155831692.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/97760052247.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160701cc7c8e55---dejarelipum.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e4290619---56364682303.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b78031b4e5873abbd623f4e00f44c4ff/denidigumanaxonoli.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d196bd8---44548860412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=icas+past+papers+free+download+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 17904 bytes
SHA-256: 9a020a5b0e976dfe6ae20dde712f342b9556e87617701110e709efab7fbe92d6
font_02_sfnt_off00016a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8D 10560 bytes
SHA-256: 9806fc30b5972602a6d5af57a5cc090b167314e005fb9dcc5fc1348f05e9694b