Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4c2994ed9cb020…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 07:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22b7fedeb27387e602aabb8beaa4493d SHA-1: 9212211ff40da3fbd926531bae7e5c706a34d8ac SHA-256: 4e4c2994ed9cb020620bd626493c4b237b401f3b52c25706ba8d1e7a8bd56a0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=fideco+usb+3.0+docking+station+manual PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b5604e5a---fobazesidi.pdfIn PDF document text
    • http://machin.kr/userData/board/file/lapobufisari.pdfIn PDF document text
    • https://salwangurugram.com/files/gosiwamoj.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/28868747149.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65406f26---68643341964.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/44923777537.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/loxujexexeviwogegolif.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608170bb29b7b---giwovemoj.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210728174136.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/xibajavixa.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/99108106449.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/16700373516.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/xulalanaxivawamadinujig.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/95728284764.pdfIn PDF document text
    • https://kermanrooz.com/img/files/gelilas.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/terotojupigebiledises.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580b25545e---12707467970.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d231b99451f---tilinoz.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/sog2iqrs5kk9mqv5vtbqrsgprm/xezavefonuxujewiw.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/mapukugowumur.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/xotasoturimorazir.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mojujulosekawirorem.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqa9o3hfhg3vu8ecb83bgr9pk5/rivenidoxeriwixedesudefe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711825157d---simadipotexowikolizeroviv.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/xinujigivamawudenifu.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/86902028197.pdfIn PDF document text
    • 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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 11280 bytes
SHA-256: f5437c5abdcfa6934925c2b5011d648a06f4b1b0d916d53d79d66c572d12193e
font_01_sfnt_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 15692 bytes
SHA-256: 4c51fed89c7877e846c353f22e167ae68c7e5a00b64ce468145a92213bf521a7
font_02_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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