Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c30cd14932782f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 01:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c8a67ee85d35d4ab334e56ca6323eac SHA-1: 209f2a721e43facd946c246b79defded9d6b6916 SHA-256: 84c30cd14932782fec2b96840e1c32817c226e38ce13460943ade4ee3580301a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit user interaction via malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://virtualpulse.eu/UserFiles/file/7184410692.pdf In PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/l2l88in3aohmlpbpveue4ckm98/8439871162.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/sonumok.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/luwodukikobuvafo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160874b288427d---nizetorewit.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/51047239260.pdfIn PDF document text
    • http://learningkey.org/userfiles/muputejeranogiduberipel.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210828141521.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tizefekovawonetik.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c18e9b55d1---49186937860.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d2b96aed---12278373936.pdfIn PDF document text
    • http://poiskvod.ru/images/file/92925726992.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c90c8bc79---kakitak.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/77011751443.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e33410b4f4---sewudozasin.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/90214808976.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/43020899051.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/16154784086.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/96400917659.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/lovejukiteralor.pdfIn PDF document text
    • https://energooptima.hu/upload/File/jarilop.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72fadc083---82493142144.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zasugubujafere.pdfIn PDF document text
    • http://otczenacts.com/media/files/81431797604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=matrix+word+problems+worksheet+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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 16692 bytes
SHA-256: ab5f5de2c1ac100b70fb22979ef99d62d610c7b98534ea2e9e82b75b5dc320f0
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 11072 bytes
SHA-256: 23fb75188f1215fbf409e4808208a230b5bb1f8ecee969e9853bb3a34431dab1
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1