Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98e9c38e87c50a2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 12:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9daf1f76b1c73b86f50383862a36596 SHA-1: b4e18c7622b69d733b83523d98ef643d0f36e381 SHA-256: f98e9c38e87c50a24489ea47f0adaf2de8cd161c4d4ce8ff772832d84b5b441a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or redirect to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaparatt.com/images/File/bedolofazilelatamimabupo.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/26fe29bd28ebb6ee3c39bd2808aa8680/demagemagoripafakovosiriv.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/vuwufirisoxidefaf.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/75761484069.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/82718991535.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210920055146.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ruwumoxividusemegilinimuw.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/49424045369.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/sojonugifodow.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/24117130997.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/60323379853.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/masufasidesakidasesomebij.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/670748740.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/zaxukesivevagaxab.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pizuvevolovunavoxadusezon.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cbf26ff0---zufibuvoluw.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/meselalaxasuludinonatufo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d7573db35bec0af8d7e2d4a36968b5e1/dokikufilisomogudutaw.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/40805725141.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32816695576.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vcbao8mg8852kd57avd5li93o1/50456084808.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/34348094015.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/82709971754.pdfIn PDF document text
    • http://nktrading.qa/file/files/jekariwunalagojinuzok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pocket+planes+apkPDF 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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 16268 bytes
SHA-256: 90a7619ab573b3c44cb4f505d5f7927305a28a4560a227b05837792425604c98
font_01_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 10268 bytes
SHA-256: 6eeb8f50601fe9dc7d71ee1b4bfd4c961d42af5d5e885ba2c93f8c7dbb2a1a77

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