Malicious PDF — malware analysis report

Static analysis result for SHA-256 86181a7d502c953c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 19:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40c98b36b33553e67cf4f3c6d0ea8149 SHA-1: dd004a5476bc4511fd9af85e3a20f58eab73319c SHA-256: 86181a7d502c953ccd782385e607b8c0e9a2ac1bd2a16bb85e80871ee3b85c29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload storage and disposable hosting. These links appear to form a link farm designed to redirect users, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jiu-hang.com/upfiles/editor/files/57927560412.pdf In PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kusosevosom.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makufixigurowa.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/madefupapaves.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907055709.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109061450527582.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/vutejijegoguvexosena.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/47672768363.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/zetidomixigiwopu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369b46bb785---87398510907.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/98896102424.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lexigazafukone.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/91954901108.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/guviritupevo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613508ead0ad4---xekitabaxerulilivuw.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/53130185680.pdfIn PDF document text
    • https://hssanesteban.cl/files/83861032471.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vejotorikejumopa.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/fawibeka.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bf209f47---21553290148.pdfIn PDF document text
    • https://sanagustin.cl/files/33793785243.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135312e8716f---96084507421.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/77276592280.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/nepotibitoxobenomuji.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://baove24h.info/upload/files/39191912107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=winning+eleven+2020+downloadPDF 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 10444 bytes
SHA-256: fba3ab738fe126a5b589e8e9e74c2c6ddf57ce7eb25f7dc9d981a978ac41c6df
font_02_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16316 bytes
SHA-256: 8fea44459d438b285ca4470eacdd39a9affa9eae4264305377f0a996406f660f

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