Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871384c43341cdf…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 11:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14ee63701c3c30b8306d61849781bbdd SHA-1: d84a8c7e800de9305d181218c7162bab882e935a SHA-256: 0871384c43341cdf89a328e67f4676ab07b1b47c60b67aea9f21dc7ef9d6959c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's designed to trick users into downloading further malicious content, likely disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://artbaget.net/admin/ckfinder/userfiles/files/57030996647.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/vezaniwilejebagepa.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/31701735894.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/35640595070.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/23661583040.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/92111592760.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-03-19-26-91.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xugezunore.pdfIn PDF document text
    • http://azizolace.cz/images/file/84508324654.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8887cfc9---zewawirikobomaposava.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50278388070.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913135157110697.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vofepimem.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c55bcb9be---41273482274.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/13439387343.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/29494840916.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jabopalova.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/98084715984.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/zanemap.pdfIn PDF document text
    • http://netart.hu/userfiles/file/riwedopagekizefaz.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109080507585160.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/15096503632.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16134283984ce5---zojovodisuzuzeworegujox.pdfIn PDF document text
    • http://trivio.it/userfiles/files/totawafenokawojozo.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/lokagozagot.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dilopatalakapafujipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+windows+7+all+versions+32+and+64+bit+isoPDF 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 11120 bytes
SHA-256: 4928292bf318fe076f53eab4ca0d746e4a88e13a3fd5f07a3900226b09e9daae
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 19644 bytes
SHA-256: f81863cf41ac8c084000b5e044d62fded2a145efa69245a2b37fea1c79920eea
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1