Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f52d852eb7bf661…

MALICIOUS

PDF

79.6 KB Created: 2021-07-25 16:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0534828a1e15713714333819f9b991ec SHA-1: 522609c78b7ec1cfd13f8d7ad5c24c3bc2671523 SHA-256: 4f52d852eb7bf66155a483d599d4528687bfa1ae03b4df8e5b744c62fdf19602
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://madopin.com/calisma2/files/uploads/ripafuxijepes.pdf In PDF document text
    • https://vestol.bg/files/file/58937124330.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mttqkqdpj3v8udj3l3gm1k4ebh/86818562222.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e930b7a325a4567d33fcaa4d0530e7a5/pisowezizu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c3264c5d---20207231587.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/58469388394.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/3158106756.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/58ada0d426c427309711e91b52b261ee/79999181982.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/23da38eb1ff5c8a7a134d0fa70183af0/dotowurin.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b587c3ba7---basiremuduzenimotik.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jalawepegofugo.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/wodajejakadado.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7c81364f670cbcd431bc579132a390ce/wivexuwetifakajeri.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jakexiwanepojotugisax.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/nebebumurakomejugeleg.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/54130677864.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210725061801.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ee0351274---giwafum.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6dda513b204cf27a0c4d1f5aa4e39010/88186306507.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3d631488---lizakof.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609110c9a4df7---wofadolovoparumurid.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4hscu973d14cc4j8025ion1fb3/85364001916.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0rmfdlsbohc5hat415mruhch91/sonowes.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd9bd44bd---guvunerozoxe.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/33652865527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=estad%C3%ADstica+unidimensional+3+eso+ejercicios+resueltosPDF 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_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 10976 bytes
SHA-256: ac297fd6e9bb69e6baa834169db7d78e61d1c35c4d83c71173322e980d4aadfa
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 16684 bytes
SHA-256: 825692cb2dd5e9d0b0d230076f5b7a8c16ed5221bb8d9c5eaf7c5ae1b3251d25
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1