Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dbb26fdfec356a…

MALICIOUS

PDF

95.0 KB Created: 2021-06-27 14:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 076e298438c3d715cf190137e13888a1 SHA-1: 8f26727b0b33be057d598f1eb9d5b0916ee6ee65 SHA-256: a0dbb26fdfec356a3fef7ef22a1eaf8c6842bb2b85b5d8896ed92d5a167e7754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=what+answers+to+give+in+an+interview PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9c052f6bde9a1703485dc21d802acb17/8810721581.pdfIn PDF document text
    • http://erex.hu/upload/file/fopetevenavotame.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec6de855---tobasidubufane.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abc103dd20a---46385768048.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/jinepominusizusukalugos.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/egdj0gp9e34foa7pao5is1d3iq/48798747209.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-12/20210612074834493931.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607167b399f38---75159229403.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/puwibedofijubewoturom.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/i5i0av5bihb1udor091adnmhi1/kufajifajuf.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/tuxelapumuduvaxukuge.pdfIn PDF document text
    • https://basisnomor.com/contents//files/bivabirabulipexemunuw.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078811f3acf4---ximorisuj.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b5f7adb5d20f32f1386a9862c0f3429c/89521163507.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xatorex.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4p5o283as459fijdtmn64q7kl7/xuvenisobuwuzepoxak.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9d76cf3758bb15c894ba828ce4d7326f/19125458096.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9paq5f3ai316sdngtu7j191pk3/wujodato.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ee68fcad463d8b4f90d8c7f49a740af/8013690255.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/18c1ea9b7cd6977f19153ea85330eb73/28209767443.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kovedavadugawimitutanizug.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/vulukuponi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/eeaaf72e19d63d181acaad7090e23093/jofuwizojinuvuxasav.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c80e24b73---tokogusetomovadowakakexiv.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_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 10484 bytes
SHA-256: 8bce3fc125fa06fa03557a070bf7ee95fb9e3ccea2d5f844e4aa3f654d24a8da
font_01_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_02_sfnt_off000156ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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