Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4baf5c9118d830a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 18:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45acd0a73dd5e005c76f17a15a9a6472 SHA-1: eb259ce1eac3ab278e24e4707a4e95b947232062 SHA-256: c4baf5c9118d830aaa44ba1c77525cfcf027d4c7291c525dccfb760729045938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to distribute malicious content or phish for information. No scripts were extracted, but the structure suggests a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613590b120f76---4204943490.pdf In PDF document text
    • http://santamariamikado.com/uploads/files/genenojemiwapof.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/15157531500.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/34882778535.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xojasuxutekuw.pdfIn PDF document text
    • https://frisch.ro/files/file/88815157526.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/31395296709.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/35960194131.pdfIn PDF document text
    • https://activepymes.com/pub/file/metuwewovojutafigovazod.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/140211467856.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7ajmpqdh7me73fojj9t6nkpp7o/7432188821.pdfIn PDF document text
    • http://domario.ru/userfiles/file/21938923525.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/bewaxidigaturuvid.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/gevawedivogifij.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/96391137607.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/14820290085.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c43409ccd---nigipawogowisiwofisev.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/gezarinevorewefenunumafid.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/guriwanegudepoxitatodiki.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614289297cd77---46593113300.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210919170232166.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8b80ef11---42821693586.pdfIn PDF document text
    • http://client.diffuse.info/files/mofewabonozoxapujuduju.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/25042598166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+redeem+code+minecraft+java+editionPDF 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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10596 bytes
SHA-256: 8c788f658fa0ea7217e8bd543e4239c4aabc63682c963ed25bedd1bba704a92d
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 17928 bytes
SHA-256: a74b5a5033d980159ab7fc72372cd7f689056e14a9a774ec3074607c528b351b

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