Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eca0c72565213c1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 08:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8821ff39e5c7ce1d0b4ad84004b2f89e SHA-1: 319a73f595c9eb437551b315a19180b65b20bffd SHA-256: 4eca0c72565213c1a9b2bed033758dfe6d04da2b9bc20e4882cf2f50a7b73bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=jurnal+mastoiditis+pdf PDF link annotation
    • https://agentcctv.com/userfiles/file/20576597606.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/zoxadejozafivew.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6vt6ukguv7r9auel8i1qrnm79u/79287038481.pdfIn PDF document text
    • http://markone-tools.com/upload/files/divilezorokiteget.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/961090ac8779e611b9f710a9257f4585/tefiborozotoxuvidadifat.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/zupawiboli.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e9aaf2e3b7ad5fa30bd3153280c25282/namitimunaf.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ji7a6suvpl256trb0g8j2hn821/25713277492.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/lijik.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160911daa03af3---bisatumeradigej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a82034c97---24690261896.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaace924c0---taragoxelirukuk.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/20337531739.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/32859145244.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/36073026033.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99a2561a5---rugatixufivifogakujufek.pdfIn PDF document text
    • http://mobitransjogja.com/files/xefalikugevivilepitowivob.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732d181f574---vebogukerokusisej.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/68482429038.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/77311748915.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108291358025063.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/be72bde593a3a2578885f20bca5c2c27/wopufepori.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/6677453476.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cfcbfe9b909454a3471c77cc4a3b46/4424051405.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/polim.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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 20024 bytes
SHA-256: ef4fbccef1b3fea30490b7bf98f7028fac54dfd229339a5451bbddc1c0721870
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 10620 bytes
SHA-256: 8b6652c4b760c0a17446bdd0b045030f10592c01873795b36da97f935bc87bf6

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