Malicious PDF — malware analysis report

Static analysis result for SHA-256 707fa396d3d85d00…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 16:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 080e789e9bce0b2d8abe43282ebd58ba SHA-1: d9826cdf4f65f0a89e3f46a08b54a6aea23eb432 SHA-256: 707fa396d3d85d004cdc943d9a957d9ef1cb56eb450198d09c756c43e3bdcc27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

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://spad.kr/userData/ebizro_board/file/77170884983.pdf In PDF document text
    • https://csodamalom.hu/files/files/sagibugabupolawusidu.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/kisedikibe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bafa48208---zakoreta.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee57b4df8---5147163581.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e051820465---88289792476.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210908212128_1521007211.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/89231982459.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219761582559.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138767bb7d43---41182555088.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/46489966861.pdfIn PDF document text
    • https://norservis.com/files/files/wagulewilovovelutigulobuz.pdfIn PDF document text
    • http://eksternest.be/images/file/93349548360.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/dirumudutarokarokil.pdfIn PDF document text
    • http://megalaserasia.com/upload///gujuxepop.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161382f970f79d---35488403283.pdfIn PDF document text
    • https://pixel.bg/img/file/17140228180.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/31320195758.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a860dbc7f---jowatugujimofin.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bifiga.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/faxixawegog.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/meramifanarasogamulapa.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/tigujamirub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=exercises+with+quantifiers+pdfPDF 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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 18544 bytes
SHA-256: 585b340c652ee5ca791641a2ec68148844d8530633fbf4fd143426161b6dc04d
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 10968 bytes
SHA-256: 63e12389e893015f58d111986234cf7b5e4a4c3c6b3851f6caff8bd91ed373d5