Malicious PDF — malware analysis report

Static analysis result for SHA-256 085686cfc385bfb3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 16:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcf788d7a4c60a598bdbe978988f9f34 SHA-1: 3e14531863957fced12536c55c84413bf21c6df3 SHA-256: 085686cfc385bfb3066fd3de933806f311f77601c7c4e6624a9a458689a508d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely serving as lures to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ldoq3snhrn5v3qer6cr30pidq5/8429279124.pdf In PDF document text
    • http://tainghe.vn/userfiles/file/wimepapulaxovazazatuzu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/6346408429.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/jirewobuzolukaxa.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hcpi4fh7d7n7v8b7dir3jvbodg/vemup.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210616010338_99netc.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cac034dcc---zakekilokotefoxodurotujix.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/162e0fd04496f231a6a42d2271d4363d/15654931303.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9774e27168466a9a8419fe2c350095b7/29385904756.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/48805655253.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dajodikulemibuped.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc8b4e73e---bokalekafiwoxo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e6d8738f506c093bc54024c36a0ef9f3/41481897129.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccd91dc88---42902994946.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/newuzadivibekevapirepubod.pdfIn PDF document text
    • https://csn-alliance.com/data/files/vesipepiwozosafavataj.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/sizidatexojevitepopumefe.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/gavovutuvugovogozanilamu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a58d7d1982c233cc50dad472b1f6052a/14407885612.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/261341517906.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/40196157020.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b7484d49---sapafajatesakasofavup.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161216a4d7b771---norosabokewexelutudewuj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/480f692419a6c7877eb6fa59b94acb7d/bavifafibilimofilal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cce+full+formPDF 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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 10004 bytes
SHA-256: fe8d2a34bd7ca1ba451e436f798e4904fcb3a4d683f9efe79b989c5d6c61dd90
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 18896 bytes
SHA-256: b2814af342c92225b2f7db1c54bc9a832b58fd1545b6cbce18bfb0a033f96bb8
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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