Malicious PDF — malware analysis report

Static analysis result for SHA-256 429d68be484c7a77…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 06:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e021ddde36b54fe01ba64d35771fc290 SHA-1: cbf3d2e74d50957a625f47a5fbce987c54650cfa SHA-256: 429d68be484c7a77305579f86d273a7fc2438a6fddcb86fd4400324fa46a6eb2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7160ed18d---6778490847.pdf In PDF document text
    • http://thuexedanang247.com/uploads/image/files/37368614245.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/nikikuzodewudexewakojeju.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/batemapijoxomoferelijibev.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64c04f6dc---42863927516.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/81500605998.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/jafibaxavegejufa.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee8c7790d478f11074a67e8543cf8bc7/95315690612.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612616386824b---zinoxig.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/52611640096.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/sujinabi.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/tusezuladupib.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/80b227c71716c41831e7dd0a144ae7e6/sokoja.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nexivopufiwox.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7i3n3m59qtp6oa36osm9cdq62v/91170411258.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f0c507d9e964af5622d14c947f71ecc6/xakamunem.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160965bf7231db---17068513393.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/72780357138.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cfe444a072179b97524abe37bd9db128/5776956641.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/warulinigaga.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129875337301---fojipotenoverikabotu.pdfIn PDF document text
    • https://nadamasristorante.it/file/kisaraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+science+of+well+being+pdfPDF 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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 10728 bytes
SHA-256: 6d9f50af23c65ce582a3d8dcf28d363f977d05674f48e7fbbbb5192e9d287f46
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 17076 bytes
SHA-256: 6e6e96f4d66585319d06d84d524f3e3f986046303e72fc0822292edbd4cb8771
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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