Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7115c7523437f3a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 23:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa1f522049d6b9a69bde2d7b6d2ac0d1 SHA-1: 383d7ec3ed9b03a09f3a88ae28b7fb8fa0415f6c SHA-256: d7115c7523437f3a27655ac8fd0edb9c33a99bb64d82b88fd8a5687989caef64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stgeorgedentalcare.in/ckfinder/userfiles/files/7132149830.pdf In PDF document text
    • https://asset-books.com/userfiles/file/vujabibadelew.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b6cbd1c6---fetozavagetaxukojimasikes.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/74732923874.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/1583432391.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/lidiledorusuvanege.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/dedosalidudawap.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/pubosapesilapomun.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e6fjhb5i3ohs1coujsg0dfccm2/lekimedavibawekonovidikaw.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/89733087908.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c78776474---vexejesa.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/suwana.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/94452797226.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793f400799---samuzavumifesifuv.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/99974377699.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/46040534317.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/49227688100.pdfIn PDF document text
    • http://debten.net/UserFiles/File/1534421652.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/58550001227.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/68186938797.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/tamidatod.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/40829446281.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/68421538390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=next+god+of+warPDF 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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 17364 bytes
SHA-256: 9059e31d0aee6d9e0284effa59986f745635738918b591aa901a80bdb9a429cf
font_01_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 10284 bytes
SHA-256: 4d338c132a7b7e82b32f96dcfde25c1f08e29230e2ef607dc570a44154f288a2