Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4430667dec19f25…

MALICIOUS

PDF

83.0 KB Created: 2021-07-05 00:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49613667da057a2675e5dd864015accb SHA-1: 9bf80fba0f45d0f8cab3d3ebb4b5065c43908918 SHA-256: a4430667dec19f2501d2eb28c45a266f3e8e66a3b6267622b2fc7155c9cefa82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdf In PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/gilogatuworonuvabozuxi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c7qqkno7ks26qeer9i07ohav9e/navurejofu.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/0pj18btrdgs38qvbs61stud5di/10777330278.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/wifideluzutiw.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/34594241982.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf1a31929b---letitaferovuxejizawepuw.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/38n12n2va5pj9q7f42k7b7p2j7/6176080949.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1cfbddd3---fumisokisiduzolugudevim.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/pogariruxaxanixowovol.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7047402e9ff546ad89a3c203bf00fcb8/95698359397.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/33893226665.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/74a1a96a57a0983529f3fa5c9147b5d8/zinazebisuwik.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210701121837180564lxigldci9fja.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e79e78e9---valegifuwidisijexiki.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/lumobaxulaxoruso.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2a3edff8---mazub.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5116a00acd5d98292c682facd3be0a5b/9710357998.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/vitunavudoxowemuxibenomiv.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766cf18e536---zanosowidabapu.pdfIn PDF document text
    • https://hsse.cl/files/56659092595.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/2657554039.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/78339308272.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xebusaferotel.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564520a410---63842003888.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1585fd5ecd31d6085376f6400eaaee46/422777011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=colour+by+sums+printables+freePDF 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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10904 bytes
SHA-256: 4993890065f088bcb72a1558ccc96524f5e3e0209b358da53b04ced9f7cef701
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 17120 bytes
SHA-256: 6112ed7eda588855a66b8b49630fee3f526714bfeca7f54a4b1b93696877d811