Malicious PDF — malware analysis report

Static analysis result for SHA-256 da89990078a87b6a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 07:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 01b66941aec3162e00f507367c3e2d29 SHA-1: 3bfcff0978b3d32c56e845d5adb523ecee75dc06 SHA-256: da89990078a87b6a86b45ddd2252e701371d9c89be7fd2028c3a391a0efd7556
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a technique used to evade security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dd89dd21---16413392765.pdf In PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mujeleduralejepidaxugip.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/47990652375.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/58722597454.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/miligamo.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/7314000311.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312a9c6a681---34515010564.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c657688---lebuwuzubavasiravosesi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132550bc526e---vazosigifu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d157e8bbc9d000ad267ab1f46ff0a773/24210300369.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161375f7ad6f6d---xiwulinukorolima.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/64805568775.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ef46f3ea---50002347479.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/labagid.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/45da9b2bc488c7f464462b9ff1d2bc83/motelebonejekefedopujaxin.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f1c24b76---tizin.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/16535791563.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/jukiwap.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kutig.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/28513644988.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/79752095356.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/wosafojujazopozawawuloxe.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vapijozevefezetetoru.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210904025606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=opening+pdf+on+androidPDF 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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 10384 bytes
SHA-256: 3192c61672d1bbb58b109dcfafed204f77c978770ceed05884a9f891533b5ac7
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17488 bytes
SHA-256: db6e91a6acc666e592300fa014e93b7fa19056f20f8c54c660866ff4ee0db858

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