Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d913eb634f183…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 01:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be5e93f92041a596151b67594d090168 SHA-1: 87037ea99ffd398450de876977c185910ed8d902 SHA-256: 724d913eb634f183c056fb092c464e92a85d7c1f0e902a8e873715c201ece1a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious files. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be a lure to trick users into providing credentials or downloading an encrypted payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aglogistics-bo.net/userfiles/file/86443996849.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ab4ac2d3024a5f83d3ceaad8484a11b4/mitesifojivuwi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4e096b20---gebuxuziv.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/17155167781.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/76449744724.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/lajisurekefusak.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/85310464337.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/netabajiwovajaji.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb691013e9b---mugenusokalefi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7083124e97---torolumulasefuga.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/40564010480.pdfIn PDF document text
    • https://bursac.net/userfiles/file/88736624342.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f892ce75b4723c2214bfa65464e42e0/sexejevuxefedetirurovex.pdfIn PDF document text
    • https://digireg.com/upload/wekuki.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/48cb65ec3d27c0025312988d69e0a4b5/buzogedabipibil.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/deguramarizutalemalu.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/rufimifizamukefovunezeze.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u5haqd7toei9pcsrs2l3ejv8ka/48286013916.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/20939563765.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610db11841765---gipuwibu.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/vomuweto.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/xugiguf.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612176aa8e641---kadefiwojekuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mac+os+compress+pdf+filePDF 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 10572 bytes
SHA-256: 84cd05335f04d4eb39582c2b7cf19e9d9d5bd6e584b174085f92134a0898dc40
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18312 bytes
SHA-256: 1019755a2139d10ae96b31c5dce302c1ebbdfec286185ba42ebf5fb7f7943e31
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1