Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd57f2180987577…

MALICIOUS

PDF

89.6 KB Created: 2021-08-03 12:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4893ee93f4b68b6892e35ce85f83c79 SHA-1: 291797a2babae9d4dcbea54f6acf398029cb515b SHA-256: efd57f218098757732b914a16fdb714d580492986fe02f293b9be4363020ca41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or phishing lure. The primary purpose appears to be redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://laborke.ru/uplcv?utm_term=mockingjay+part+1+full+movie+online+free+streaming PDF link annotation
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25055454378.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-12/20210612070941407920.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/piruv.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf746901d---42987838457.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8989fe8c---93133260796.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/91471385954.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a487dde38---87001975051.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/ziwawamewi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46f19fb1b---97691550719.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/zewidobena.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf548be0a---bezefonunolo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdbd03cd2---sedikisipodujokanofeza.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210505155134957420034.pdfIn PDF document text
    • https://dineflon.com//files/vupidelubejobibav.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/5567630895a3db01387255e77190a120/wesanugamowonubarumoxo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/nob1d5ur5q7am7nk7k11jj13po/4489639821.pdfIn PDF document text
    • http://charivne.info/images/file/paraxemiv.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/nisokaxatolavevimaxiv.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/xudumal.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b78f6bfc66a189ff50a5b13bd864b03f/81746018792.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ea6c96dfb---wawidimovinivowovapotopep.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a2cf47660d21d4aad287a3d1add2fd5d/21531558918.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uhjfnacdm2s0gdttukg3uoecb1/zoregufedapituz.pdfIn PDF document text
    • http://juha.be/_files/file/75586201821.pdfIn PDF document text
    • http://consade.com/userfiles/file/bomigakor.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vawunod.pdfIn PDF document text
    • 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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 11368 bytes
SHA-256: 132744e1fa7601decb2990bd155a4864714bcf90582b6cd8e877323a230765b1
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 16984 bytes
SHA-256: 0592661200e2fade69d669bf2562f8efce8e377862621e9913f71af5060733c9
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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