Malicious PDF — malware analysis report

Static analysis result for SHA-256 e950de026e644e63…

MALICIOUS

PDF

92.7 KB Created: 2021-06-18 10:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8b50d4aa586f6ab0a762f05eec602277 SHA-1: 8ba763d27f7d943e909503834140959c6e6737bf SHA-256: e950de026e644e630355c52f928d24798220eff19452d7b0bcf8971a088ce92b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute other malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b5428b96f4c95c418e9b03921d105d2e/28393179230.pdf In PDF document text
    • http://studiobaliva.eu/userfiles/files/kuforejowedawesobavidusu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/bodajunavileluninuk.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502125559276918.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/673a26c8a80fe4d254f4166212abc71a/zezanojinovesugedidupew.pdfIn PDF document text
    • https://mszukam.pl/dat//file/numiv.pdfIn PDF document text
    • http://temple.mo/userfiles/file/25341398627.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac418293f6---2349193053.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a164113d3fb4bf20a17e27f7552cbed5/62059150531.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/66050704004.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d2a0842a1b1e7171e1a780e78338ab45/deresovudosalosajeju.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6394f03c11bb501697f4e8e8d27c1abc/67245618204.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/70vqv2askjcno588p79plp7g4h/fabefumilusaka.pdfIn PDF document text
    • http://fitviewer.de/files/file/58006953634.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160806e5319e0b---senup.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/61634005010.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xumojevanoxoratoxelunabe.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/dbd0202b71d4d6da09222f0fde903bfc/52655280042.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/29491195011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=o+mere+dil+ke+chain+by+sanam+mp3+song+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 6076 bytes
SHA-256: 6e781c022080f2663ee2d822caa933ea1d64f3f00ea14619310ba29f7f2ddbe0
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 6552 bytes
SHA-256: c443dc65324f1645d5e5f9209014aa36b682bf12eeb88752a7e93ffdc435c12a
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10948 bytes
SHA-256: 6e6fe03eed3d73af05d9b616e8f7658db19f92f078433860fea2c913f751475c
font_03_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_04_sfnt_off00014416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14416 10744 bytes
SHA-256: 701417686e2cabaf938cce3b0beb8299bfca304f4ec94fbec225f80998c23715

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