Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8ad0d17d634cca…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f839600ca90f43ab6ae1ee5aecf53588 SHA-1: 0988d10d1d9c4cf9bd7c9acd9c34cd07e1b81761 SHA-256: 8d8ad0d17d634cca94a08860c1d0d97244d5df6f7532e2f97f02a24c4480d4eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=profit+and+loss+worksheet+for+class+6+pdf PDF link annotation
    • https://chokysitohang.com/Uploads/userfiles/files/bizikanuvu.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/76791742317.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210723_073022.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/mawogupomajamu.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108261055197011.pdfIn PDF document text
    • https://tmtteks.com/files/90905355318.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/1637964239.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3ad2445f---foziler.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/luregepu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/kobiw.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/23e40d6da73836d1c25fb14c384f866e/jekukarukisaneganebesimu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/wuxudi.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/vaguwopiga.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/77437234441.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/83668880635.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0b5d70fdda1508d6dd6d57e1c49c02e3/katuk.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d27acae134d---58306413023.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081692b12928---pivisawamag.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4bb1409c2e5ea792051119be3dff70bd/49388385785.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/gagixozolojiturumejik.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/24530576183.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_off0000b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CD 17288 bytes
SHA-256: 045ee41be76cc9867fad01c792e30aaa79095ec442a5bdaa1bfb28198ced9999
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 11064 bytes
SHA-256: 1b44affc3106f8f8ca686d3f5603d83c5a527cc121c0d2988a1e1d38da9a70a7
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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