Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae788e893426b81…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 05:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35f082a0e57087a78bbf0c6bdbfb75bf SHA-1: d9e44513f730c07d0b5b1b1b710464d343b29a63 SHA-256: fae788e893426b812cef0de532378c0eec0992b151a84e0a0031411a25e2c4c4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's designed to exploit vulnerabilities or deliver malicious content. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The presence of numerous PDF links and the 'utm_term_redirector' flag suggest a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://csaladiegyteruautok.hu/userfiles/files/35952582708.pdf In PDF document text
    • http://4yoga.by/pics/files/79377846905.pdfIn PDF document text
    • http://cartopack.be/Images/file/farinusoba.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/550393975.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/73189311399.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dagosuwapubedagasata.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/jetelonigadenalegigit.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tafobazubosidi.pdfIn PDF document text
    • http://art-ball.net/files/file/49552792658.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/40577760510.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e602a529---29651540124.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vawutomuvapafaxaponuxipu.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/5426191725.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/1183775783.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/32284847267.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/webomirovadewukugezawoz.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a535cdfd6a6be17ca85a37d7599fa46f/92229928651.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a5irp65vb943au8usir8mb4515/42292686012.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/betagilamo.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/22822914671.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zevelizemazowedurowili.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/zekapebasumaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=xunyou+game+booster+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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 10908 bytes
SHA-256: 90d9e4109def9cb2fa1d33190e23c9aeeb3af5ea73dca8677c11578048a51f2e
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16476 bytes
SHA-256: b0510f67e43e348505da29eb224e61a4d1999c4a75686c02ebc2960c991a5c67
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1