Malicious PDF — malware analysis report

Static analysis result for SHA-256 b763963cecc71907…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 04:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d726ed884bc9fc875e010345a2bf409 SHA-1: 8da7ded493682237a188a383846060f793bfea18 SHA-256: b763963cecc7190702bdcf8ef7b370069eaac80b9aa0fd1e930ed978bfa5e4d2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o4udgdu1p744nvujmp4h3np2h0/7534273701.pdf In PDF document text
    • http://selmanoglusigorta.com/userfiles/file/jikavukamodituzupajese.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27503241786.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zosufu.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/pipakaz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53973686e---96719538251.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vakurenamavebiviki.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/07a59ebb1ca3ee088657a8f874817102/23844539380.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70ce74477---65819724723.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/11465332662.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pfaslvgfkuh6otpm8klonj0q2s/15377654045.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210607204242.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/ribavabozaxazupo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a53a5243---labixukuwagon.pdfIn PDF document text
    • http://waypl.pl/upload/File/vepusarobixetafisigimori.pdfIn PDF document text
    • https://posh.hr/files/pukomasegezapilosadi.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/92752582696.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/81712088158.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/14225948122.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/34080743812.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/67678848511.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/pepefezafudikan.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca58c1bc2a---nakigizenaxevelor.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/mudifuxinow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=distrofia+muscular+de+duchenne+tratamento+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/97c65246230bef6e70b8f314ea05d410/25120734824.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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 15220 bytes
SHA-256: 8123440c569eb69fd272f34a4e59a127f5811bf10fa6c3664d7469469ab773d4
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10984 bytes
SHA-256: 087f0b12fefa077f90d00d138cab7f83b391815bfd89576ac7a70f197eb10962

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