Malicious PDF — malware analysis report

Static analysis result for SHA-256 884a9d2f5c453367…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0285426d29d1eb0b756218d563475883 SHA-1: bddc1d8ab9abb3f656536d62991285cf591262b3 SHA-256: 884a9d2f5c453367cd30d50deab75ba7a236f2382cc7aa44b8a3d9768fde38e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites and raw IP addresses, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7e38253957b526f7f5b81c72ef4c49ae/85369408811.pdf In PDF document text
    • https://itexpertdog.com/upload/files/74427778912.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/81182171196.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab73e49e6---bogoradobemapopu.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b845d454---45498787751.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/22177570964.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/79066ba9f84e98eb08080f241dda4804/zisepatavexelewateweragax.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ae96dbb46---54823952488.pdfIn PDF document text
    • http://gtshotel.it/images/file/gusejuf.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f38f1f52---revusapoxar.pdfPDF link annotation
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a62c3c61a9fa3858a6132b203d8fdb9d/55704605279.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/62712759421.pdfIn PDF document text
    • http://garderoba.sk/images/_file/68860968289.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda51362713---dekubakinunegidoxula.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca747e806---xilajisumijub.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xelirumumabazixedeze.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/dazedevogoxasakiwi.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/kuxoloduko.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0442b336---pateritipaxagubokufivopin.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/pomomapoxidubimasir.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe4e00cdf---30624190312.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/4abfb9d8ba3f6c4deab619dcb79dffd5/puzojonuxixaligaxupux.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/98742255193.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affbe652dd6---2776330674.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfa564ce3---goromadivugepawedimo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/30a01ac26bc3f875305b0e3c5f300a97/44532993679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+loreal+hicolor+blondePDF 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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 10784 bytes
SHA-256: 7a2d0a34ce315ab006a25fe2dba1c036fbfc8682fdb23858f4440fa4c24aaa99
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 17140 bytes
SHA-256: 3d1290a824c6d79a1154c38245967211cda1ef06e1d3edb4d4cd0a5d275b67b2
font_02_sfnt_off00014001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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