Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce5c19c957e658…

MALICIOUS

PDF

91.8 KB Created: 2021-07-14 03:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a3634770a1be7f6abfb73a36387420c SHA-1: 03bd30a5ac479a17436639eb0bc0af7670fee81c SHA-256: 26ce5c19c957e65842efa0903fbded5d025e173aa74483bdb2c9e7e168fc8a1a
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://plasy.com/uploads/file/55753459736.pdf In PDF document text
    • http://gardatrans.com/content/Files/91873104320.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xesobijirafoxudumeva.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34408539776.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q3htcu60eeuqe289t80gtlmt42/35392983639.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/ruxedapofubajox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mdp7sq3m0mtk3hrrusiseasv25/pufegumefemelurirugokini.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/gotodonusilifovivexe.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/xuririv.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25beba994e---rotosukodedigefemiruvovox.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66750457144.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cf9f6442e80a74746e86daeedb3daba7/6370855133.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/39224226331.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5ad5547e40929fe2050a4da10fd3a185/46126948234.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298aeeabfe---jomexizigirivudidap.pdfPDF link annotation
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873d3d51711---jotidejoruwebig.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52e22cf21cd75fec8544eecb124937fb/delodelojosiditokonig.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d429b14de063d6fbb57cdb62eca3d5e6/96227624677.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/29372481109.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h2n8c6imr42n4gdir830g9d79f/1200157685.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9e4122f43aeeabb6d7e7877a33822563/38837658573.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf606906a---ganedo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/30939571768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=intersection+of+three+linesPDF 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_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10224 bytes
SHA-256: ccb2c0699126acd0cb9039a5aa6d6fbae00f721cb2091816c427a67ddd8e0113
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 17576 bytes
SHA-256: 146b8f31c6efa0c8342da8aac51fb2788745c0c95f1c3c70939d14b9b03c9346

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