Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c49b456ac7f682d…

MALICIOUS

PDF

91.0 KB Created: 2021-09-16 20:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d2f27f28e3fbf42f4aa9b0a1dfaa860 SHA-1: 4ec2915978401b03bff1601b9cde72c771789f6b SHA-256: 8c49b456ac7f682d685277f1ccf239a96e2777ebce3e2805859e1569faa76daa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=bloxburg+song+codes+2021 PDF link annotation
    • https://deltarents.com/upload/ckfinder/files/gikitinogepekolefo.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/36099305137.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418c2bb747a---jodamokevanuvugunusemilu.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/vajedexazemume.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/84898800520.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/54794994374.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/fatakaberod.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82311423524.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ek608jodjj33kr9cf4tv2v4bb5/vigofujexemitazuv.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasaxuzeb.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/51976343538.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/bukixulunasesilifugu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/80759306968.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/giritadurevugapubajilif.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/53275030881.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/5417326742.pdfIn PDF document text
    • http://anpharma.net/upload/files/wixajagavogunigid.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/momaponid.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfffe044b---fisawufubijebobemad.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/keneli.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/95226163018.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/bigajun.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/45320073535.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_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 10884 bytes
SHA-256: aa3783d3c6f6f24fd039caad229bdef9d76bbade5feed4415437e0fe2cb8caec
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 20204 bytes
SHA-256: b1358f383fe96496d1b6a04589255a47da339e5db619fd0c9d8bfc76a2d71388

Open this report in the interactive analyzer, or submit your own file for analysis.