Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c9f194f491998c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 22:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 501aad17f01d01fa1d40e3b58df475a5 SHA-1: 7f96c89d916b5ec12147f4a47280e4777a54adf4 SHA-256: 89c9f194f491998cac9543b5af3fde05f5397029e3a716ecda5ae43dda2cd1b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://laborke.ru/uplcv?utm_term=set+of+parallel+lines PDF link annotation
    • http://iswii.net/ckfinder/userfiles/files/vaxotezodowakag.pdfIn PDF document text
    • https://termofriz.rs//files/xaninaro.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fefudipakalepaza.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/diboroduniw.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/68869372717.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2bef3554---pufiba.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ed6df3b5c---50119535006.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/66473848024.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886d5e0fc3---5585002822.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/sevuwolenidixilar.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/60383247152.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210803064944.pdfIn PDF document text
    • http://huefpdf.org/upload/file/15804147357.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xelibanemed.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a61a0cdfecc0892703a49bc493ed9c27/62906693512.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/75973236033.pdfIn PDF document text
    • https://bor-diing.com/upload/files/junuritazetij.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210721_715B89845054130E.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/l3lhe0rjqk65t5rfi5eko3cbi4/kuwojizegi.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/62561913519.pdfIn PDF document text
    • 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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 10428 bytes
SHA-256: 9bde8cfc7bf95a5bf7c7c208dec054b0d23a94e017c13d1afbf13b889a47c6ee
font_02_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16480 bytes
SHA-256: 7973700aec8daf6f1f5118e4c8a653c9ac875013cc6fe687ca7117c9fbbb2974