Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32e322e854036a7…

MALICIOUS

PDF

83.3 KB Created: 2021-07-01 19:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abf60d211bc05e5350343409e4eec7be SHA-1: 7d974734aaf5c721aae61e399a27cc353f4e55a8 SHA-256: c32e322e854036a7f092f86fff9a25052ec7fc3998bef9690261c25a3933b5ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The numerous distinct hosts and the use of UTM parameters in some URLs further support the interpretation of a coordinated malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=path+of+exile+lab+trials PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166b4da9bc---4575496157.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0ac30a4cc49ab10b9eed6226c334fc16/87050355284.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c7a63d01---45673277171.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vi89qvpff1n4l0fme0o1mvl9b3/kotesuxufizigoged.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5133520726291ce965ae50ea1d4d4986/mevizuxap.pdfIn PDF document text
    • https://premium-house.uz/images/file/siraxamedeseruxobi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/39796656067.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcb943b00---ralimof.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/416537d80e97e93ef60d93beacaa47f1/dubafekotap.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/13201313295.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/7239333784.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/06258f7672e5afe28d5f2670d6677f20/wipigutinotara.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0025a68be5---31633941777.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210629_141914.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/wekujuwamado.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/12375481201.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/4296607375.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/bejativixipuduxife.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/wefipokuxutumevuvibe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vtt3brf1ptfs62slrlc32veom6/31418871613.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/pifipatizafukisixuwit.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/wiparenewepira.pdfIn PDF document text
    • 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_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16832 bytes
SHA-256: 94e85b7df2eef3dd6b3889d83da8c92e187d602fb62be58d8aeab088bd5ae369
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 10448 bytes
SHA-256: 12ec693e24f8d24968f1a3f3ed4337994d0ff7671b013db13b330e11d10ce1fe

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