Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbef1c68ba906926…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 13:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a3afc30c0919b2cf1b14691a2a3699a SHA-1: 8fdfa8a616563376ec46b1e58fee698e6a5bfc8a SHA-256: bbef1c68ba90692622dbc2598754c443782696cf76cb9133e470902e6749fb3a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing operation. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://evpersoneli.net/ev-personeli/file/guverugil.pdf In PDF document text
    • http://tvkinter.com/file_media/file_image/file/wapotonobo.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/66195088135.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wekunugofifuzine.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gevubakikumivinaxomus.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/36057431318.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e045fd89c2---23160746857.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4c04e54f---jumaxobomilazedejup.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/21874777215.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/675dab2eaf2c2e0d029c1876eba6d3c4/95574849905.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zujamizokubudeten.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/48806271714.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/jamadidigapop.pdfIn PDF document text
    • https://produse-zilan.ro/files/13256178912.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/46456952011.pdfIn PDF document text
    • http://zenithmetals.com/files/vuludufojexaxovobawijeja.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/mamosazebenasomajegut.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60669005511.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/megim.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/398abe0e60319649bc40be465271c158/96670927947.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3ea4c53e6---46552137008.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/jafefelaxodufunivi.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/63035387212.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xilupalodev.pdfIn PDF document text
    • http://sro52.ru/uploads/files/bujine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hack+wifi+on+android+phonesPDF 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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 18444 bytes
SHA-256: 3f8425e487d9f255d01ac08bf677de205ad165dbd156af289269cdd00511b084
font_01_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10840 bytes
SHA-256: 0b1874398b3c04772c892c988e408878a7a4ea68e9487a2350e8510a667c6b4a
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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