Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eb45e91acfffc0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db5202662e60b8aa762e6dc203099037 SHA-1: 814f16e802d6262ddc581e59635a56e726482140 SHA-256: 37eb45e91acfffc015c3792b48d2a0e1195385da3c47a31ae4a3b9f9470a1ff4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=moto+x4+stock+rom PDF link annotation
    • https://fluffy-chins.com/images/file/89085416172.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/15919045831.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/49968738471.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dck8kk2vg6hm970oi01msddln3/zinodofipasumasu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/koluxunavosil.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojibexarexesozog.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/31096213709.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/bibilagume.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/javemanuru.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pevuwaraveladokuguwes.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/lufewakajazidolupogit.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/jipafasodurum.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613002fc65fa5---87941511464.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/sizagitapafub.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/36785185328.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/47609424381.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/73850182214.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8c5dcc1b5f07c7a5bf49c64f5d6cbe4/godulekidodefa.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53155338910.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wupazorufewusabije.pdfIn PDF document text
    • https://digicpictures.com/downloads/vireni.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vevunimamupupa.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/67725977961.pdfIn PDF document text
    • http://storemisr.com/uploads/files/61429714297.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/davagafofejituzezomodine.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 18184 bytes
SHA-256: 26e919221135ddeb2e66837a1649f1639dd80ed814d1f1003f91036b3e1c618d
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10120 bytes
SHA-256: d4c830753a9f808bcba6520a238ec308c7a12bd63a048e8535afcd600bc0feed

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