Malicious PDF — malware analysis report

Static analysis result for SHA-256 99128bcbc9832d1c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 10:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e447b95c1c6c91be6e52e44b530a8e4f SHA-1: 729c61e2373db9d65c06241da5aea95817f8a519 SHA-256: 99128bcbc9832d1cecee3ad17f3da090674a867cf53cce78b9464c60042d9809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=worksheet+on+articles+for+class+5 PDF link annotation
    • https://bocrangsuthammy.vn/upload/files/14443914941.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/baboludi.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/binorixugilepigata.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/51765372310.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/73068793792.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/dilaxevaribaxesojag.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/78912499389.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/14479881786130111cdf337.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a5isqlhm93ufvg9re8gb5b9qts/97506086436.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/87418036188.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/72080589871.pdfIn PDF document text
    • http://naviway.su/upload/files/42618095122.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/79802454041.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/9997109550.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/38197369338.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/lenivakasof.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/wutetujikeluwazifujuxu.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/78150483773.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mapejusig.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vamukenuvilis.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131184b87a75---jamabuzarewizebufogivevi.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/44724218944.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f80b9de85---40746917204.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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 17756 bytes
SHA-256: c6f578907766f9dc48307a12d760a875334ecfaedf745b944cfac201d53981d5
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 10652 bytes
SHA-256: 4b75b623e42139ac7f04e1ffabd9cc772e3f967e49cc4473ad3a2e2876550d0b
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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