Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e042b5ae502a3a0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 13:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b466d510d980f25c9c135a0f51780f7 SHA-1: f2d572423b505f291a241625d73208c2e79022f6 SHA-256: 3e042b5ae502a3a00db40c1df292cce077eb56753dcf6c8b88a63c0912fde823
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 it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://anjingliar2.com/contents/files/gesizaluvev.pdf In PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/12183427712.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/40422650995.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/9918336993.pdfIn PDF document text
    • http://araratmebel.ru/img/file/rudilafitosiji.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jabokafomovul.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/29768072292.pdfIn PDF document text
    • https://insp.biz/img/file/waxogozor.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/muwawuf.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/84468aeaab04b40199f352cd31bfb258/xajebuziwonojosotibasapa.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/pasazaximezel.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/75bhj5t27rc3mcjsu6hdnidecd/dijugufogokopatine.pdfIn PDF document text
    • https://12tiga.com/contents/files/jotoseku.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f8a242ed---favufinumakobejux.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/20464365626.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tonukolomupazo.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wepakuzeb.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/botedibemeresujagul.pdfIn PDF document text
    • http://carcable-bg.com/uploads/pictures/files/77978092522.pdfIn PDF document text
    • http://splogservice.ru/content/files/24183939660.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mijugoxunesiworafa.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/13808495410.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/7757197101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+record+android+screen+with+audioPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 18092 bytes
SHA-256: aa06ff5b1941c1a0886d74880ac6fcba052b9ef365d75cca7f52cef4f7d8cd67
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 10600 bytes
SHA-256: bf5bc12fa58ea7fc44817c12e9313f214d10e40782026140fa0207a7a36b4700
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1