Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff82975285f5923…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73a4c31c473104a575012455d5405dad SHA-1: 62c2c43e86f4e569c5918260683abafc135ca848 SHA-256: cff82975285f592389cb46e56d4de45cd538799feaf5088e411dd173bdb9df4a
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports the intent to trick users into downloading a payload. While no scripts were explicitly extracted, the nature of the links and the ML/ClamAV detections indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=download+lucky+palace+slot+android PDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21089197457.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/64349997232.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/fojozewusopekidoluba.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/wowibaveduri.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/34118714587.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/nopil.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/20839106555.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/72113329596.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090400265073499.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d355028a15---wamesuvifojefiso.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/80525065789.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/malisimozilo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/09f8a2df6fe009fcf2cf6d80b33fbaea/87408768869.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/16362836219.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/96328058981.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pojemusuvekabalorida.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/64738577034.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/2863706345.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/97093975018.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/wonivitivutim.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/27753679918.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/081f1dc88d7a6abb07885ebeaa1b5249/78410790286.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_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 10900 bytes
SHA-256: 06f98f92735c9eee430cae325132e96a83d311566ae1e9737068f4aa83a7eee1
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 18272 bytes
SHA-256: 11b45185937055fe8f31507c4029e47dfeca05b5a446273e99dd6f118a463724
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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