Malicious PDF — malware analysis report

Static analysis result for SHA-256 447631c14477dddf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 02:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecce1449887a60541b4e86d87346740a SHA-1: ff3c50911d2193c7570e9c9e11eb5ed00988f843 SHA-256: 447631c14477dddfc8996ab824ba5354675189576e2f190be61e8eabd88d9449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=note+10+launcher+pro+apk PDF link annotation
    • http://impex-italia.it/userfiles/files/46084108358.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/83888605238.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/bekavumepupapokome.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kidetukepar.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72804139666.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/1045407088.pdfIn PDF document text
    • http://benrassam.com/uploads/files/72994091272.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/niwid.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/doxasopoxududonopifinab.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/29448950732.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gaval.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/88347202175.pdfIn PDF document text
    • http://selidbe-beograd.info/files/ximijivirovuleziteloge.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b7e00a038740871b1583f92a051fe873/55670679850.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/zinikopipikisetivesawela.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910071427871.pdfIn PDF document text
    • http://erex.hu/upload/file/nudusun.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/laredokisefikut.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdc173ff7---27302867042.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/38070763310.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26053fe7---menegelofixajuxusupadeda.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/depobimepavofusuw.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/99666358150.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/16967691840.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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 19112 bytes
SHA-256: 0e421a2cd2dfe1fb5bdcb5403ebb28226d32e20439632b1fac0c31a6d9e580c2
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10552 bytes
SHA-256: 5a1e9fb0132820593d2c7f8a172c0697809b7b773cf578be8c69c9efb77763ff

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