Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d4bad2a0fcc359…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 00:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 611a3c39028c0655b52b34b08a5acb59 SHA-1: 43373a7325bd14204cfbd6064d337983f5d0c43a SHA-256: e5d4bad2a0fcc359cceb79276ec347128ba0f2ef145c238d3d0ddfe2b129d0ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an intent to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://airconbank.com/upload/fckeditor/file/wadapisizosatib.pdf In PDF document text
    • http://constantemails.com/userfiles/file/16287678088293731972.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/46729175596.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fbde7b61---rifixok.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/76979667976.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/368f4c5d9c36dff719a2ee11007906a1/zonekinutibupepuli.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/xexuzisorapek.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3d27f97a---39603583374.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d16m38ga865g8hsrt4fe1bdup/26308113330.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/jegut.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/1664694637.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/00918c3f632de822bd93fc4032ca8ffc/siwudawonorexosawadeto.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/33502682673.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/84229683123.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9b47d563---99434557521.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e11302ebf2b0d1b398c32f2c4a5210eb/3989827968.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/50453209317.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68b6c8407---pazetopazurozimijepudig.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c029debc22b6f4b837c5d06254759d01/25102490019.pdfIn PDF document text
    • http://ymmicro.com/files/files/7895965205.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106122051458386.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/2hjkc9bu5c0eq78jf7iqlv63m7/nobemegatikutajumanaxil.pdfIn PDF document text
    • https://kar360.com/resimler/files/69691908600.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pavakero.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/51823467065.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gimalaxavuruko.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/jidafasoxakenoliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+possible+values+of+a+random+variablePDF 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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 20188 bytes
SHA-256: 65b458420ce8d63ef20e49b921f1ee32699f9501ea2176e39bcc8eaef03a054a
font_02_sfnt_off00014880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14880 11044 bytes
SHA-256: 369ea8669ca9d17f69197dc656d57945580c29ea537ab81a874fbc29e2dd1f17

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