Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abba7b3406f196c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 05:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b778efc3b3e1ede8aabed41accdaa8b1 SHA-1: df229dca02c7c3c0aa2c7df6da2e9c448da02219 SHA-256: 1abba7b3406f196c3409f054fc717a017a417059302c8a7d4d97d68761909c8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file is a PDF that contains a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/m281bal5botn229700nkfb6u26/mibuzuvipatizoronugi.pdf In PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/vovipezirudikepodopomiwuw.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nuxezusodesez.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210719_74A0EA8B3015C23B.pdfIn PDF document text
    • http://clarasonic.com/upload/file/jizulebole.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/86577744740.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/79dhj6dd16ehscus7j6pceidb7/magawas.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/jawojozesumisu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/91259612167.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fegomelen.pdfIn PDF document text
    • https://bczenekar.hu/files/file/56194238309.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6e2a0708---mijulugureberux.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1eab0f9b8---4322821786.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/76358195475.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/ridovinowekubo.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xirupu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/59041325146.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/bajirukafofafanuro.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/puwunaferedutetuwoxiduzer.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5580dae89---16978299462.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/8c374590ece0325fd9b2b3eb43bd65f5/zofesofozimisitobidawizij.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160958cce4727e---29221625998.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///rexavafabulobagoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=design+and+construction+of+fire+alarm+system+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_off0000bba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 11180 bytes
SHA-256: b362d378e4f657e415d4f2a1d9177b491ab916587b8a9fa08c5cdbb4792a5efb
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 16156 bytes
SHA-256: 7497edd0a603713512226d80b6504aa3bd96afd7c3dd4e7de4d34701cd29e6d2

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