Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff4f75e38554571…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 14:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48cd327d1f4504657b361dd2433e6c0b SHA-1: 5d8cfefb9ef7f1022939ca4fb49de75e8dcf4bc6 SHA-256: 7ff4f75e3855457137b89de9b057e76db1b7b20c47f6e7428835a46d7e622596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=nikon+d3300+manual+mode+guide PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f48b5fe49---55584287116.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/57945245304.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11621352f0---99277443678.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/vefizuvasever.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/ruwulo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kblh8amad0hu3qvi323jb88og6/tirubopebugekoxake.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d42507be---vewajafudupasunudovow.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/pidolodokasolukarinu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/24178748617.pdfIn PDF document text
    • https://papiratisk.cz/soubory/vinixiz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/195e47703cf3ef0775edbebd3880481d/58831521632.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/87524443570.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/23541387454.pdfIn PDF document text
    • http://deltools.com/userfiles/file/7805118876.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043021184084.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/15444849030.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11d5642d7---76561571815.pdfIn PDF document text
    • http://muszempilla.com/files/file/16078638289.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160832e7ec1a43---63053158342.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a64604165f52f945d26fa15d79f12980/baguwibunegoligozono.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/fawuwumevisokekuv.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/kapoxawot.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_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 19380 bytes
SHA-256: c7d3dc71acfcfdd93b3ba4789f26cfa59120a4ec3f128eef66fa49462a3d6612
font_01_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14597 10688 bytes
SHA-256: 045bda1311521747d5128a22d0c8b02ca9150bcf55b2d1146521a533ccbee221

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