Malicious PDF — malware analysis report

Static analysis result for SHA-256 861492c3c889f980…

MALICIOUS

PDF

89.9 KB Created: 2021-08-25 04:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1f3ff247164361d142cc8eec9eb67f2 SHA-1: 93bf08e748bb76766870de7df039c6b0757cd9c5 SHA-256: 861492c3c889f98037e2e8ecb2de5c5e2316c335129519b0eef2f8a4df22f6f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b66a5c80c9---15759820886.pdf In PDF document text
    • http://srutimusic.org/userfiles/file/xitaxabuboxekutigu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/91304968376.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/8462692833.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f40024f23---35048953806.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/49ah29f1cpoifa81bv5jn0i3i3/werapu.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210821001736.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01a92dd10---34865861383.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cc5c2d4d789d453782d44d81dd5c3cc1/meposesibesulepanitaxanit.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7cb7570ce---jameruduwe.pdfIn PDF document text
    • http://boratohumculuk.com/ckfinder/userfiles/files/dixatagiwefokefojeril.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4b9cfca47c3e4e39a6baed76b895340b/20544016453.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e8adb600---gesuneki.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/57601068843.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/99848653048.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/dolagusakebe.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/15310277999.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/43566731847.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a7890b688e3204e69851a68c344abee7/gitagadalukuledasuzoweza.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193a57a374---739417330.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/cf0b16ce25c90afa3f2099d23fa22d57/zugogijideweji.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/n1cp3jghqkdgsbjvqs8cbrhjah/luxewenus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=give+example+of+codominancePDF 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_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 17728 bytes
SHA-256: 3b04a07c99e754a7ed73090b74bc1311325879571be28e14e4c780a3af89bdae
font_01_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 10624 bytes
SHA-256: 97ce50a6103a6064ee49d021096b19be30d2fee713e58a383ab7c6df2437a9b1
font_02_sfnt_off00013f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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