Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f6803087919a46…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 03:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d495e16d71c4e45b56881423b7d5612 SHA-1: f9742094a715a286441c7712fc15c388f34a31a9 SHA-256: 49f6803087919a46c4a89d97e9eee923574f91cdc04a2452b6a657233a77d3b3
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. While no scripts were directly extracted, the PDF structure and its association with known malicious hosting patterns suggest it is designed to exploit vulnerabilities or trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161353bc44a719---90827996372.pdf In PDF document text
    • http://rubivina.com/Images_upload/files/vejijaxelusoxogolibexuluz.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/xogolajefiganowek.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xumumoxabetemed.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6d1398ec---wujebizilafubafonag.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/88008746101.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/19450661197.pdfIn PDF document text
    • http://aprt1day.ru/file/77784775279.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/98155908847.pdfIn PDF document text
    • http://chpcentre.com/files/file/47227325138.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/doxutufi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/45147432730.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/14814819626.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xajakinaruxenedawa.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/29513802895.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jarorev.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc38eeb82---39826346289.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/besiwuvepexugiwix.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/48375728573.pdfIn PDF document text
    • http://riph.pl/userfiles/file/rufubaloxeve.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/zulufavafiwufiwigiviko.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140427084298.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/zuvumumiwafalozawowogiwak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stickman+fight+game+mod+apkPDF 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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 10920 bytes
SHA-256: 27099655ba9ebc09249f00f6b2eee8128739ed6869053c040f9c4841703df7ca
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 17848 bytes
SHA-256: 223cb6d354f7e6dbf7054797e15ea4d854ec8c9d3ab4e04fdd25fee5fef80f4a

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