Malicious PDF — malware analysis report

Static analysis result for SHA-256 39868b9d8b9f5e45…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 03:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14bc111c6a852a8e0e2acc2aada4d206 SHA-1: dc19d8e96bf9cf9a1e1eb639ba2ebc3af71585c7 SHA-256: 39868b9d8b9f5e4597d88966a139551f9f8dab0e90ce912451a198d615a62bf6
176 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's designed to exploit vulnerabilities or deliver malicious content. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The presence of external URIs and a URI pointing to a raw IP address further supports its role as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aedwea.com/upload/foto/vuraruni.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd07eca8f---35668078329.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/vipuzuweponotaveti.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/11570079741.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/pakojobomoziwowumedokugo.pdfIn PDF document text
    • https://bonacorsi.it/file/kunojusa.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/nigatijowimamasop.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/safajekebivuma.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a158672e8f1c6c137b596770a1fba04/ramajoxujeja.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/givuwajonun.pdfIn PDF document text
    • https://wrd13.com/force/file/majekepewurudupigojivixun.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/56546608054.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d4751b4c1c28229b570bdaf7103106b3/77892092127.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f2bd1505---laxefejuwibeladugi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pamadugapojex.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f003298d3---wajedaposomowu.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/vatami.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210619035545_899n2j.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/507faa7234a2a0c8fb6afa00d1aeee48/jafanimajana.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/gadeponomazolizivim.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c620c9c97b9c47450a92289949e8896/15602793033.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/barudoriv.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/sg6d59atq6pb7mt21j031s0k90/medujukefikepivevum.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/27470489678.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/45295336662.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2e63a50b---fivor.pdfPDF link annotation
    • http://thongthien.vn/upload/files/64242504437.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/14018203360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+j+test+hvacPDF 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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 18076 bytes
SHA-256: b7e7f505c58192b1018dc57e42ec75b16c9d437759cab3d2aa20cc9d7ad64308
font_01_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 10304 bytes
SHA-256: 5d4c3968b7b8fce28cda99de37f0b078bb1a660166fb425d8d2d8717a3143dbe

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