Malicious PDF — malware analysis report

Static analysis result for SHA-256 b500fb8eb3715f76…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 02:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30f23f65062abf294f3df245dd3667e4 SHA-1: fc8ff4cd09e438d3ee97a224684bf8597f680b49 SHA-256: b500fb8eb3715f76d972f8a2b1b5e77af37c43464b4521a8fcc8ad84a1c79daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, utilizing compromised CMS uploads and disposable hosting to host or link to other files. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lab4050.com/upload/editor/file/69909066324.pdf In PDF document text
    • http://cpils.com/userfiles/file/97330283505.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/odc5mbn5pm5b9dib6p9u66jm0m/29201143211.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/49649319015.pdfIn PDF document text
    • https://geloracinta.com/contents/files/67982463474.pdfIn PDF document text
    • http://canadanur.com/resimler/files/muwebojojenowemezifiv.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/betanutulajemovo.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/benomomosuzixibozaturege.pdfIn PDF document text
    • https://turbooto.vn/upload/files/18244855407.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/61969135558.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/mogawojunizavugovisomude.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf42c835a---20448509839.pdfIn PDF document text
    • https://foulardfotografando.it/file/kikozimarizamep.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/1450480920.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc35c5689---pujekoki.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/74094912062.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/3430681046.pdfIn PDF document text
    • https://km2804.com/ckupload/files/28873438758.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/legomujirinuno.pdfIn PDF document text
    • https://cityface.cz/res/file/surepus.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wozurevufigasesojida.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/57870724802.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/weruzorafumed.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/nuturimedugorenogigironit.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/2468708401.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/tepixifefanomemenulager.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+mobile+lite+mod+apkPDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 20328 bytes
SHA-256: 70026be6456722324d2e4f5abb141eecd1355c023666025679f8f90658d6358b
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10696 bytes
SHA-256: d4c7b106663e78ab8744d3c46320043a3e163ba30def97ebdccb3a6cc456a68e
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1