Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50037adc3a89187…

MALICIOUS

PDF

103.6 KB Created: 2021-09-15 06:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 743ad407361bb7d9e52a2f9a3fa3ccf8 SHA-1: a40f82b6cb2d860fbb7120b5ba25eb5a362df29e SHA-256: e50037adc3a89187f19a5ba8903667f7e126a2ee6632d977f5eb62eb3dbc742b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://kapsalonvogue.nl/files/file/misufakibotibekopoginim.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141627d3c16f---japedomozofumujabewor.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132efcf19936---ramazawuvepidulene.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910095813267818.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/popolodo.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/90683644275.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dawaxitanenadepixaxiw.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/latifudaje.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/38659960828.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/46764698969e6519bfd184cc5fc861ee/safesus.pdfIn PDF document text
    • https://phunhai.net/upload/files/29637423386.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131353549551.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/zumigebuf.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fojomamuk.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kogojufimused.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/fevudofo.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/tekuzidulumig.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/daviguredaru.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/bunotazapefep.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/63304260058.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tesumagosaneduk.pdfIn PDF document text
    • https://pokereshop.cz/data/file/21197572861.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411b6951f6d---mukesinorili.pdfIn PDF document text
    • http://dfanchem.com/upload/files/21741026239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=1101+binary+to+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 17104 bytes
SHA-256: 381c3d712ef90fdacbbc27440ff748779d04b856b755fdef74e92487b674de79
font_01_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 10716 bytes
SHA-256: 95d0a96da542506ac90e1322d0df9e3133aa242e369762eec78bec01a3448949
font_02_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 19640 bytes
SHA-256: 7e006c0f741229c12e07baccef64cd367810441c3d81bb7a41c0473972411b0b
font_03_sfnt_off0001782b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1782B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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