Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17230f672c8cc1d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 08:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3930f90919dc86019359053563c884e6 SHA-1: 911257dbe613ecba34f5ade41c6bc2ca205a3ec7 SHA-256: e17230f672c8cc1de5a767fddd01b9f2cdbc0681b4ee94fa1a376a47092a47d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to download further malicious content, likely through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://wastran.ru/uplcv?utm_term=dls+2019+download+apk PDF link annotation
    • https://myshalewell.com/userfiles/file/7108135259.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/jiziwutaxisaka.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e50236d57---kiwonejoweko.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/dejiriromigutadawakup.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/74125737583.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/71946603175.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sageximumesatigafogax.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/buvele.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911064322-jisuzapikifokikilulumid.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/85031820601.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/16749612810.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/mkhmgfddoqdvoea7efvbd8cp97/58931579878.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/jofewiwazemazaloxiladi.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///voxanoxagogidibuxox.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/jatunafevivujanoju.pdfIn PDF document text
    • http://health-bridge.in/upload/file/42345597510.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/38069607259.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vomamesatogebaju.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/51257824290.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/liguwifurekunar.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/nuzufegezekamanugamere.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8acb09d635cbae89060341f4512ecfa9/buroladoviveguzimoz.pdfIn PDF document text
    • https://trexanh.net/upload/files/25578219952.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-18/20210918151839308119.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 10604 bytes
SHA-256: a9fb17c3ee8f6601ed9e016970014f13391b5693532535abc41abd11ce75d54e
font_02_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 14296 bytes
SHA-256: dde25c259053c283ffe0bff5d5a737f1cd10ff38a29b0c62926e89d60137137e

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