Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4c142fe25fc2a…

MALICIOUS

PDF

79.5 KB Created: 2021-08-07 16:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d91ab70d4ff3fb1dcb0541cbe685b42 SHA-1: c1ba003a411bee1b7a98a33651693fe949f22fb9 SHA-256: 3db4c142fe25fc2a02872144365f69b944ab01b9c83f3750c6f5a4e74ff753f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00a987d026---65359520635.pdf In PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xoretemawufetazoba.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fewuzanojufatabiperopa.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/31412635594.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b278364e3---fetafuxisasejetosod.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af1b72f44d---lexotakegozosefaxi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/50267184136.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/diponis.pdfIn PDF document text
    • http://www.celso.org/download/kokisewopimomeki.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/73700105519.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6956143243---dakupikipivefaliwamuv.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/57267182280.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/komisowemux.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/48920973269.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/m6v97bebhvbddst4mh3bs6mag1/pesasulejekifojumil.pdfIn PDF document text
    • http://c-amc.com/upload/files/22472838292.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/10878482952.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160813e81a3b13---getiximolajorexoj.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d75ca7cd1637596043d60f30c3d86716/97909853085.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/felexaverasetiz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9b775c69de7754cddadf46e93bc6b260/govepaw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607882ca0c07e---zugigiki.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vokufatobu.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/90743373222.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf459d604---83684687008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=formel+areal+av+parallellogramPDF 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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 18392 bytes
SHA-256: 9559f8150cb3f8978d79c3c233bf6d451dc5582a81878ac593ca8ef747fa3bae
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10176 bytes
SHA-256: dcd82ade7800579faebd56219b4e0335575ab2a9b8597874de8b06ca54d54b75
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1