Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f02e644766f45f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 04:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f766307ac360e8120b95b50be6fa357e SHA-1: 4eeefb61f6b864cd7c79101aac3b0dd2a3178a98 SHA-256: 92f02e644766f45f12aadfc8c9a8dde28d7857964d592cd63a25151cb26a8fd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=block+puzzle+star+plus PDF link annotation
    • http://dichvuhieuchuan.com/upload/files/82729320836.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129d801667---kobisekoj.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/gavaxafowirepitexoguziwir.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/pusevarox.pdfIn PDF document text
    • http://dentistturkey.com/image/files/3160997649.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/55035244641.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/9133721803.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/72769023874.pdfIn PDF document text
    • http://shesob.com/file/files/58172201661.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/306574ebf301e986168dc5b2c91f6315/muzufumewuvoduwovitiw.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/34043692695.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/80939360695.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4dee71abbdbe40bd14e7278a399a7df0/fonozejemasikere.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/34551584886.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vudixiziradetibototulijan.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/loxivadofavubamapesusene.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/46249609494.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dufurizonedunim.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/bonurarope.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/jitogulekaj.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zutagukifusojinuw.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 10476 bytes
SHA-256: 7bade2a352ec1c42f13967ba694ea83b9de38d78c7112b3b8f9359322227f5fc
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 17500 bytes
SHA-256: 3e46136b3869de683f70f2b212fb3f0eb6daf3ea5d9219e5e846931208020b5c
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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