Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcb764722cf7394…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 12:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a029581e2188e181a46cf749c845fa92 SHA-1: 9008ab8d54e579aa510a9e3daae8a913810aedfa SHA-256: edcb764722cf73944b7882f24ef7ede4a2714542dc1f35b020635e9c791e517b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, with several pointing to compromised CMS upload directories and others to disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://christianschoch.ch/userfiles/file/15060388611.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/fajemirubavuxududakat.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/xivumalemumavekaminud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rurakowufeganaxuxubaxepun.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zuxosetikekamunexunow.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wejakotiwi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210914_42C4C49F66ED00EA.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lolodelal.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vefajudan.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021929142247657.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///67640869630.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/mebimutepizamexoneme.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fdb2b5427b4c9a01f9acb129221370b6/80347908057.pdfIn PDF document text
    • http://carbontuning.ru/file/bogodobugonizojofetosu.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/16684661.pdfIn PDF document text
    • https://buyafranchise.org/files/files/bogafa.pdfIn PDF document text
    • https://signika.pl/Upload/file/48431648643.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614671bca0228---gonegab.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/zoxezexifukexena.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zideborenilawoxofuwab.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/85142950888.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/99076753482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+take+tramadol+and+motrin+togetherPDF 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 19032 bytes
SHA-256: e38734e76e675eac1b3e916d6066f5954fa056436ac59b5a576edde7bd1a0ded
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 10864 bytes
SHA-256: 9fcb58d37ff0b53e26064f0ca5ff58aa23ab5824ba2a29e8f23953ae09cb3ac9