Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df71cd2df834d6c…

MALICIOUS

PDF

71.5 KB Created: 2021-10-04 22:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bdf1ff626a671b12f134b0b4e5c365eb SHA-1: d83cc657183eb338ad4971983c0bb79dd2caa7c1 SHA-256: 1df71cd2df834d6ccf87fe84b2637e9b28d29ed120e929679fe7696e8d3752c6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to host further malicious PDF documents. The heuristic firings indicate a link farm strategy, likely intended to distribute malware or phishing content. While no scripts were directly extracted, the nature of the links and the ClamAV detection suggest a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=other+word+of+best PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/49201141434.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/21382270195.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36990057743.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/90916872840.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/bolatofoxanuloda.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/rugokep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2b5ed341fde803f627936b0db9e9ae62/dugejopexis.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xejukepabe.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a415d1e7---19906464508.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/97797165566.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49655152167.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/wuwuzajarexorakaf.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/detoxumina.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/fosadamakijivativ.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/bokefetexomomuzoxawirun.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_AED3A275FFFF73BF.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a8032edf85eb5145b0ae04d75138b30/5458546347.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614466f226a7b---49617071436.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/davixezumutinugaxe.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/19703872718.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/badefebevutawisalogi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/ribelovasej.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/pumekimubabanivigi.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/gajezomoditibugapoduk.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wojogurulasizidojerosedad.pdfIn PDF document text
    • http://npas.ru/pic/file/puzulugejusalodutaxis.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bosegami.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/kagezabel.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_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 14952 bytes
SHA-256: 712cfec7cbaa103d961496a7c64351d1b571940ec2485084320d3420f93307c9
font_02_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10296 bytes
SHA-256: 30f56b4f93a404781dfa38e635f9551b7da6a1e7a8c7c62736dce25027d32be3

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