Malicious PDF — malware analysis report

Static analysis result for SHA-256 263137c8e5518d68…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 01:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb5748216859c2537b44b50342be43e SHA-1: ad30c61ddce8e1ac1a6c0663412d0fa28f02c8c1 SHA-256: 263137c8e5518d68389fe74a03ca6c8df53b300f688a93b10166e0d7cd2ffdc3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS upload storage. The presence of urgency and download button lures further supports this. Although no scripts were directly extracted, the structure and embedded URLs suggest the document is designed to trick users into downloading a secondary payload, likely malicious, from one of the listed compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088db8ab1f49---20042379437.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b974031cd---nofapaxukodibixaso.pdf
    • https://aspaeng.com/files/image/files/sogozok.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73b48d2d82---ropodenawovedumi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608149fdecbf8---87326517772.pdf
    • http://paillasse.hu/userfiles/file/jebivukigutowewedopekaz.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/76854320438.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qr80nodsa7dk5mdprd7k1f2foa/majezatinamuluzove.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f82995612---zebav.pdf
    • https://cissud.eu/uploads/ck_editor/files/54573962576.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2ac9656e---zuluwewo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b1489c92e---mezolepibalubinirod.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8d041ea1---782611716.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098300450213---fajenaxikexedarivepelo.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e0d12jbuucnaehu4ov3ksoe5dn/geverox.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8042871245b2d92a8ee0e0c41568fa03/68168166416.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abe08fa7d---42368679139.pdf
    • https://brtim.com/uploads/wysiwyg/files/xixapivozo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/23475307795.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bc9ff797a06233f69003a7c5ed099748/votetewomulukerebop.pdf
    • http://nsfeed.com/_UploadFile/Images/file/vewefesidagadevemel.pdf
    • https://banghenails.com/upload/file/suzovij.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e47f3d8c6acd2ef110cc65992127c034/90722400168.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tracing+pattern+worksheets+for+nursery
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e305.bin
55031af3fcc907404b3b8a9743abd2c719280986982c40932a8602c49339599d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 11068 bytes
font_01_sfnt_off0000fce3.bin
6f2259a0b1332f41f3d076e6a706b2e33f5277ac08457ea6287febd9cc98109d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16736 bytes
font_02_sfnt_off000127fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes