Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c8baa653e0efbd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 12:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4998da8bba1e32726572bc0797e75c38 SHA-1: bc5d22916ec1bddee1aeeb18bd54f96d49b400d2 SHA-256: c9c8baa653e0efbd9ecffd94c998a7eafd0cb62d9dc19abc4e0fa3dc28956d35
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The heuristic firings indicate a link farm strategy, with URLs hosted on various compromised CMS platforms, including WordPress. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lss3rk1h5d2ne57o89c711ugf0/52576045048.pdf In PDF document text
    • http://clarksville.net/wysiwygfiles/file/24971274170.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/9131770439.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/vulasusobebutekewefo.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/73109749513.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096cba0a9472---55387237916.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4854355294.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4532937d39---novir.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/zosilonavazitipeg.pdfIn PDF document text
    • http://klefmarken.se/upload/file/37613716786.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/kotixux.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160983cf536359---lugaxomelo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16108a1ee7892d---lefebebadukutogilogeni.pdfPDF link annotation
    • http://syuncyoku.jp/upload/file/roreve.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160871a09e5345---54759108977.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210820_BDF4CAD1BCF77BD0.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112e1ea0cd89---wupilitawawi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/kasexisu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sd9p7n30ggc16f9vgg7qs3n8bm/93504660158.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/7075298052.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7585d99c94uqct93tht94o1df3/bogotetokifafirejunibozil.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dakevonuwerogev.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/95877055941.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3oc1idqip166mkv5jpta7rpaf7/xidogekozuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fibrosis+pulmonar+causas+pdfPDF 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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10768 bytes
SHA-256: 73009fda30042859e18f174ff6b89d406bf66bcd98f9ae0a8edb9f4afc0f7047
font_02_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 16580 bytes
SHA-256: 65142c1d0182cbb0da347c63c4e33dc813fcbdaed91385d02927c91b31adbe29

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