Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b5120b15c8b847…

MALICIOUS

PDF

106.0 KB Created: 2021-07-02 17:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89ce5df7075b0dc9f7790a7844a2bb1 SHA-1: c3a2c5387c82546771c4285af6be634d9f2d465a SHA-256: d5b5120b15c8b8477bf051470b5bf9a525c512bb764969ab65d1f56c1faa5834
164 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 heuristics suggest it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into downloading it under the guise of an invoice or payment notice, which is a common social engineering tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acf39e6245d---pasinejibamevagepitulepon.pdf
    • http://feach.ie/images/uploads/file/51306240190.pdf
    • https://hinodanang.com/uploads/image/files/dekivoxofeg.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a9c77862f4f182a1501e2d50bb485c46/56199558773.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/2510d9efe34fcdb6232c81ba5efc9e65/90228158327.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210629_073710.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4b61e342b1f962026217b7027e340041/juxiburorijer.pdf
    • http://batiment-tunisie.com/userfiles/file/73996645306.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0aa35d44d758329887bc220700e90a1c/fogawil.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kmr67131v47lstkp3b4uhrg4k0/96601271262.pdf
    • http://matras-devison.com/upload/file/25667829530.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d10729740472eff3a575884eab123174/65411984934.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3dd5321b---nexupesovalesajufa.pdf
    • https://calmoinc.com/upload/editor/file/23713443850.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3be27e3ea0d92e1c233e0abf8fc88bc/64783423227.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210613_5F236F477DB0B917.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/71889756299.pdf
    • http://driver-jazda.pl/upload/file/38925289057.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8934f3b16ba27dc0b573a4ed2df74162/69699802670.pdf
    • https://rybczewice.pl/userfiles/file/23631403911.pdf
    • http://amctop.com/board_data/editor_img/file/202105120656.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f655914fdd---duture.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb636601a7---85392045411.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=employee+separation+notice+form
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012366.bin
107e041a04a70f8a5c511c11ff6d54294c05b98835b319b717e0bef98441a782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 18404 bytes
font_01_sfnt_off000153b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153B7 16792 bytes
font_02_sfnt_off00016bc8.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC8 16140 bytes
font_03_sfnt_off00018145.bin
cd7e1857de2e5e756d7573f185455611248b7c605f941c1b6139113a2be1bbab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18145 10736 bytes

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