Malicious PDF — malware analysis report

Static analysis result for SHA-256 f811bf0eebaad0d1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 04:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29aeadfb4b63c8b2cb5988d49d4cc79f SHA-1: 27e888ea1cb0e2c1b385590ddb87c95b6bb0ebd4 SHA-256: f811bf0eebaad0d1ab68a5b4cd622e8ffd831fe91eca5ec81b91188c69f3766f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8fd2846b97a4472817ee71d87e0acc30/55819048412.pdf In PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914142237.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614432861b1bf---70332092050.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10388736471.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/16465852227.pdfIn PDF document text
    • http://oilspecchem.com/files/gonujopoxibisatezo.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/49509300602.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb292bfabf---vugojewudamolevewepafol.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fakujexabajuzasesikozax.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/56319157302.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/42845011427.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/53963472036.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/moniwijarebupoz.pdfIn PDF document text
    • https://sambelteri.com/contents/files/gokewuzodiwonekal.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146f894c5026---44164947757.pdfIn PDF document text
    • http://goref.ru/files/file/nomope.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/70734316355.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902120755_229890696.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/32220598166.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/23508841352.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/9308530905.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rebimitilitazavofagosose.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/68279750011.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/33654764313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+free+robux+without+emailPDF 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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10808 bytes
SHA-256: 515f61c2ff80655846390b0fce51b529ae25abbf4df08c8e2452eefd9b341fb3
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 18164 bytes
SHA-256: 0ed3edc320dca0f9f21d376ec8f37f2b9d44642512e61586e894673abb869f7c

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