Malicious PDF — malware analysis report

Static analysis result for SHA-256 e785517acb96987e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 20:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2042bab5dc87d191202043ff6c9f0d8c SHA-1: 14ada11d88ea8b6467e5e00a08927531b7df22c3 SHA-256: e785517acb96987e24af313bc60378ca9a3697b0ca8ea4d06e39cadd5038ab55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=news+feed+app+android PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6abaa1db---kadupotizabewipujakexu.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/mezorarifaj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe590d8c70---78726865052.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/bosokak.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357236306b6---71411152682.pdfIn PDF document text
    • https://vientangluc.com/upload/files/60863026690.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/jemetoxase.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163148318226dcea07f272e141f.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/sunakorewolofuxube.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zozakiwexenipep.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/2272047312.pdfIn PDF document text
    • http://atrsara.ir/resource/files/62173092740.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1350056404.pdfIn PDF document text
    • http://mgrima.com/files/file/degidibebodofepofatukin.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12932108748.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/tabojurawugomudojolidi.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 17672 bytes
SHA-256: 9f3d0f6190d6219ca5c82b06ed6de49a56d70a0c6e7770935f36c9a61c9c453d
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 10412 bytes
SHA-256: 573b0d1eebf50731a62b21188ae69bcdbaf7ccc4a1d8757e8ab7b0e982650e06

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