Malicious PDF — malware analysis report

Static analysis result for SHA-256 722f320915d7ab12…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 04:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 164e3d0415b0e14203c1cfb047e0a159 SHA-1: b932b697918e454e4e11baeb7f3d658b3b69e91a SHA-256: 722f320915d7ab128e60d16baf6ea7b8104c013604573ede6181e94eec53e959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360edaeb344---42629706676.pdf In PDF document text
    • http://ongxoanhdpe.vn/upload/files/vademojawiraneg.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zoduvojodu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139287cbbd6f---rutekut.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46880441425.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dac688513---74823767853.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/64330778100.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/85450309920.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zadunekoboxabozanojapa.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/8364992700.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b486c6fc4a3872052b4d5cdeb52c2c23/sejudovizajizupin.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/gidebijevodug.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/98361304262.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xisajiwijebewa.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/35489901586.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/kowukosagibe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wetikinimelulopi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/5488914509.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/70478341403.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/44433175534.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5d84ec01---41118914121.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613512e384fe0---tenekuvogoxoveb.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fea7b842a53199134fd3dbec1ac860cf/wevuwese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tamagotchi+meets+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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 17944 bytes
SHA-256: e819e9ca83f491c9c527c201b3a00151f997175cdbf4f493a301effbe4eb5d59
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 10624 bytes
SHA-256: 86ac30db96e0de914201bffab7eb86ac6f00e5d5a6f162d164b796543ea397ad

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