Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b0abb5457d70c0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 21:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d66d5ea3dd629794cfc4d1c298697766 SHA-1: 171f5e499a9f9d497fcefdaf08a42cc584c53b7c SHA-256: 63b0abb5457d70c011ea02431c6e12fc03a79cdc9b343a444365754eeb452af0
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The presence of a 'download' button lure further suggests a malicious intent to trick the user into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://eco-versute.com/app/webroot/ckfinder/userfiles/files/16602410520.pdf In PDF document text
    • http://uekekb.ru/!upload/files/81558090803.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/sepadugu.pdfIn PDF document text
    • http://scantech3d.com/files/60214227289.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/93693036192.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ld0ab4fnii2m2835effnukahpi/rasojepo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/27480012863.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/2961161412.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/vidisojejajuburix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/209e0a8348e577aeffa0d013b349fb62/lokizevarogeru.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/62069182846.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/fagasebofefag.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ff3f95064---92504082879.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/96564090213.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/vakafikede.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/natedaramulosaru.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/kuxegegewuwegebavo.pdfIn PDF document text
    • http://hmed.vn/upload/files/78944866489.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/wepumomomixu.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/52983308251.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kfeqcoi0omjan7c4cfsi2s5sgq/waboli.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/jogudomaxijaxugegevawim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+7+software+updatePDF 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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 17004 bytes
SHA-256: 4eba185be1f493d7c279bef41537060cd395cc95805da1b724f379c6bfeaab9a
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 10788 bytes
SHA-256: 5a8b1efc05879ee8a02e93e758391eb05431b7b2acf434531d7d620d8ca002b6