Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cca60f36c81330…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 03:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6354a0bdaa69581c634392b020e6c95 SHA-1: d3bf9e56da2f4d8162ff0456b5108f7790f11312 SHA-256: a9cca60f36c8133060b5cc88eb95363fa577885041636be63a631c2d3e3df5cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to host a large number of links, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=rogue+company+free+codes+ps4 PDF link annotation
    • http://maszyny.pl/userfiles/file/52709107947.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/topajapidigipa.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/putikov.pdfIn PDF document text
    • http://erictex.com/ufiles/files/vopukufitabonunesapale.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/36127702101.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/38672667535.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc307dc8c---24486630948.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/36111525405.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/juneval.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/7106787249.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff6fb8eca0b2d0ffe8aa999befcd5fe8/18481895843.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/25058935509.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa3133d3bf---63782815148.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/putajexoxebejirebijole.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0862135a77b1623d4e11a8521769af35/wetelokamaxiroku.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kizolapudonomowareduju.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/9823294514.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vowater.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/80460787168.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109101246038019.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/simibenagesaliluv.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/95242524956.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/tusafumifav.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xekaxilelikepanivudaj.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/rolesoxex.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/fojuz.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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 11064 bytes
SHA-256: 1357e5b820426225c4a2d252c39ada846a049fea82c8ae84793fbcf113938374
font_02_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 17300 bytes
SHA-256: 2285f84e81d2391168cfd42595e5af753e7d1cbddacd16b18f71f77ea463908c

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