Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca459bf9329aa33…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 01:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 47db7c64f2d15a99d56dc4e779b79f2e SHA-1: 13ae5752680db0a32e8a5833b7462f541cfa9fa1 SHA-256: dca459bf9329aa3321788885ad225eca42b10716af493a1b905c03b1923adda7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://degeninhotel.ru/admin/ckfinder/userfiles/files/tazepowegazivubunozub.pdf In PDF document text
    • http://texmet.pl/userimages/file/12656898745.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/lexujujaxadefak.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/gipositugenuzuletevefebav.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/918a91760e3d7bde9ba7120c8a46e7c5/vinexugalus.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/16153265467.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/99868245190.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad11624c42---napawojipofaganat.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd9a467b3---22087765126.pdfIn PDF document text
    • http://air-ned.com/uploads/files/9703517485.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/bilim.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/50290724999.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d17ddda6435639742d502d10e68c0f12/6348122636.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/juwuxakepa.pdfIn PDF document text
    • http://tyextractor.com/d/files/lajaduxisinujenasenigo.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0612/03631bfc7907e7d22dea2e35d7b84fb7.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/a86a2673a9979fc9e052515f58f71c56/maputubaron.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/27147851366.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j9hcpeiqn8p0beiclpc87gt555/jedowisugiso.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d9b2bd12---fozuzazolezudug.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f72c9821cc2893bf30df4c6d048b7620/78360568916.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4549b208c0db18807949ce43a5fcb3c6/kelazigodegamimevibeve.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/16950595772.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/xexuzavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+sims+4+city+living+expansion+packPDF 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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16700 bytes
SHA-256: 80cd370240a2895fe81a924f0b5a708dfae6ae81b9d7fef02cf3649ea0913bd0
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 11296 bytes
SHA-256: 32f8183976246e97627687a971b948abe547d39e06ebc5295aa9391fd1540cb8