Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78f09aef76bac5b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 13:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56e2b1e3a7d1ba72dbd09b56b084a537 SHA-1: 0f1ad1debc0d96026803d0c45a6b1c55a7a25b1f SHA-256: d78f09aef76bac5b9046cae55d6b3fcc3bc9eb3ebb98a58690a7f3924211ebd1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://studiotecnicolamanna.com/userfiles/files/maxudamixe.pdf In PDF document text
    • https://piauiaqui.com/ckfinder/files/60829784796.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144564b93f6c---15126420835.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/25913509012.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xeluwagojaxatujil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0890f946777363b357ed0295be80d13f/58569110983.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wakemusavo.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/5237718167.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/46148110111.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7f3bcd28620f300b1fb8e31892e9c1a6/koduga.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/vabiditeputedigisekilepe.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/23093661806.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/bobaman.pdfIn PDF document text
    • http://medrea.ru/upload/files/80974809604.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/73c81098ad75c8e9b03410a35ac110ef/wixisefimi.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fimigawisopiramir.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/50568927804.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/46035689728.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/84744139555.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xosuvilep.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/xefufutogajajefigije.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/8091357312.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/88982096012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tekken+3+download+in+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 21920 bytes
SHA-256: 7416534c8f8f6c21789d517b3a08a79fc9f834b3b092b61624fb5d53e4915634
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10288 bytes
SHA-256: 7f18ff84b96b7faf6ad2b28b2594766d615563994f5f2a1eec5c743a0147ecf5
font_02_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1