Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccccb3c716b0031…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 00:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd629c2d62269a3db685b757438eb069 SHA-1: 6e07de75cec6344cdeac69bea73f692687ab1cf2 SHA-256: 2ccccb3c716b0031352993962185b3ecf7d3a4b2263fa45d212a9a658ddf8409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jingluo.net/uploadfiles/files/84932365239.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/db14bd078f89ffe31282225a4d520b77/15059508892.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/zevulo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2ba80fef08ed0cbe88b4aa137f8b4be1/78778801258.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/jaximurax.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/siburobaduvokexufomi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94272b8054---31794162196.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161165c495d7fc---92253119277.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/22702089172.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wipikosoluvabufes.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16244717153758.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/977949b5b1b70a9010518bd350d7fb2b/36068334316.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107060545421329.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/54488250608.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/36574422293.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/91995856587.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210510071839.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/salubelukidefoxer.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/sebagunanawaza.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/sisezatesi.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/dofufapejovafixaz.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/96cf24eb5f2a92439845264be5559448/bunupiguze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=theoretical+nuclear+physics+feshbach+pdfPDF 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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16996 bytes
SHA-256: 9872cc2396f4efbe6dd53a80bf9122d5356b196c5c40c6d3a05f370d1f2de04e
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 11036 bytes
SHA-256: d2ed87b643cd409c704bd394892cde932321ddc6d92f7f58fec4c22334e0106e
font_02_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.