Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1782a6e3614f84a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 05:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc1a0c77554fd1f2886b68f7551100e4 SHA-1: f13cc974a893d6d2a7547105c3ce36a931e10789 SHA-256: b1782a6e3614f84a451d24784c2215125f0facd64607e2532f76f8e5fd4894b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pellevah.com/upload/files/pitofexelulezifo.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161384e6c8ca89---jesunamewuremisutogu.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xuzudilugosepajupisit.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/49604117702.pdfIn PDF document text
    • http://puisan.ru/uploads/file/68855737628.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/3296437539.pdfIn PDF document text
    • https://vientangluc.com/upload/files/malujerumi.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/vusevumoxalozoxarojoz.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908041948.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/95655871141.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/kedafefez.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/4103765232.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/banimexonirotule.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614424652fcd4---11337031430.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/45810967027.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kerokukawukezulomu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/woboloxinoduvew.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/64003343417.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ef753e84---76623659953.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tetusadalusadasusaxovame.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/54423339981.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6813e5f3878d9dcf44c9a13abc449583/89375670662.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6e108a71a376f9ce065beb39bf4e3998/wonokerovenebik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=come+eliminare+un+account+gmail+da+androidPDF 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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 10676 bytes
SHA-256: a528cc49199007074328bb46cb42f23b18fe7fb6e7854f86030595538151ae0d
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 15380 bytes
SHA-256: 4e7bf40228571617f8c0107bbc3653f88b15faee29ce71417a2aeaed4d657c40