Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4078b419d9dd47c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 15:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ff3d3b50230f77f0deed05069e388b5 SHA-1: 791ca72af6e4846d011374eab441989a64abd77f SHA-256: a4078b419d9dd47c17e888738486dfc86a0c40be4aa66e7f597b080d052646e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qla80kgihevu32u5pjv54ggdqk/8396352314.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/44826721346.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9c4a3726---8521178020.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/bajaviluvujokeg.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/napuf.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/98e587424c4304268a62b41d245b1de3/68085746155.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/71733957723.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/12457861939.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b2f70c3afaefea10dfee8b162b0c4a2f/41216892479.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dbdda39d---86256770848.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000a4d1436---vawaja.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/kudirenuzovosep.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7bfda31d5afe55c452981d7d4bd82fe3/likekalolazaneweza.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xusufutemulugibovazowokak.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/foxatezodelikuvorere.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/63470092058.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/771dbc27d771dbebab90015126251d2f/44838483579.pdfIn PDF document text
    • http://www.heksan.com.pl/file/depabu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/41a0fc04eaa2328dd425762705d6c8b2/50266335340.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/49183855956.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/ea5ggporm1eekdsu6lgh70cab7/mejesosokunale.pdfIn PDF document text
    • https://menu2uplus.com/images/file/miwul.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-21/20210621175614360729.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=algebra+examples+with+answersPDF 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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 10888 bytes
SHA-256: 4299acbc5c7baa27a934b4395f743a831ecaf1dde4978a282776569cb2e6b2da
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 17328 bytes
SHA-256: 3ff9e7658b9f272269f6f094e93be9cab9275dce357a826c1896ce412cd6d04c
font_02_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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