Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4185d65e5690ef5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 00:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7f09456a57ca6c0b01a59d3fad62d9a SHA-1: 13dca0b3716bda1104fcb4db98ed1c849a433aa9 SHA-256: a4185d65e5690ef5251e71ccdfe0cd376ab13ec5d45261f7d19d8d8849feed52
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URLs, including one with a "download exe to apk converter tool" UTM term, suggest the document is designed to trick users into visiting compromised sites and potentially downloading malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the use of deceptive links to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=download+exe+to+apk+converter+tool PDF link annotation
    • http://scea.edu.mn/ckfinder/userfiles/files/dowezelezitupu.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/jimesasowigazakeb.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/muzovegazuxoguzaxozisaxo.pdfIn PDF document text
    • http://opersan.com/file/ruforawefemumowo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7e3e7a824fd76a002818300f3ad6de9a/kopop.pdfIn PDF document text
    • https://euchebnici.com/img/file/dotumimesopasi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30e0c8203---fugazokonasufa.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/15441891754.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a3d2a2acf096c572d84627bb22ead88f/5966140812.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/38069922979.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fosimovidegulisavagade.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/25063064546.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/65062969808.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/lujovub.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/79029895753.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/27249913018.pdfIn PDF document text
    • https://windsbs.biz/files/file/zozagoxomobabum.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/68290482079.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/xugexawugewel.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/46355305624.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/zajisexiwaga.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/zirokebadanikajepi.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/45568152675.pdfIn PDF document text
    • https://rubfila.in/files/file/36140732109.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/50508566458.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_off0000bc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC55 16096 bytes
SHA-256: fb8dfb7ef27e9cc7d0b5a36f78f44fdeb3de3a1deaeeca3319f4b3dd063c3a52
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 10592 bytes
SHA-256: b8efdc81187f6418c9b7e724261b2071fff4f0088b350bfb2e5084e75655e28d
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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