Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddf34a19a530cf5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 580ff337b35f9fd9fd5251f7ba30b88a SHA-1: 4570ff4f5686d7f1efe12a84a95d7d8722d67e14 SHA-256: 5ddf34a19a530cf5575bca560f0b9a43b61ecd3ab71119476018c86f7225f970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a significant number of external links, many pointing to unknown or potentially compromised domains, forming a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://chrmglobal.com/userfiles/file/30492916470.pdf In PDF document text
    • https://internationalmedia.com/userfiles/file/pazuwiguxisalok.pdfIn PDF document text
    • http://stylekd.ru/files/bajabixidixufedada.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tevusefojetuzarorebam.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/linin.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8c80ffb4---lapirefamaper.pdfIn PDF document text
    • http://carszana.com/image/upload/File/ganazabixixukefeluxinodof.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e439731603---zasiluxevifebonaba.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/67304405785.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d89a46c8---46087039971.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/bkjajmjh96687n7j52rlu190r4/90310679032.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d368796f---34870092816.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/tojuvunaxiwutiwujarewo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/398048015451620484292.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/63522931951.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/64f23e7d3281377864f1a6ad1feec66e/27055044623.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108192329426605.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/56033914401.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c854037f4dc7564d54897656a99cb4d/24449394795.pdfIn PDF document text
    • http://thaide.org/userfiles/file/77451792355.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f062743---kogenisoxajopobub.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16128b46d904e1---41753699299.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/aeedc9ebbc73650a8a0c622bbdd34493/xomezujetelekaxiw.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/woxojotobirumaramijepe.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-13-07-01-28-19.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internal+and+external+evaluation+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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16628 bytes
SHA-256: c4dae61ad1d5efe6526658a999e163160eb9f51727d37a19355820e83210c2d2
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10540 bytes
SHA-256: 218149fbd5ff82e177c0f0b00cf150e3b758087c00302d80fdda7ada65448a18

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