Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c1ebeb985c6207…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 12:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74fa2369b83044be8b2ec8e15ba267e8 SHA-1: 32d6716a3012605ca9e9df7e490f759a78da9b21 SHA-256: 55c1ebeb985c62076b272781a2494751ee20ac224ceb92bd6838f7e8eecd972f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, many hosted on compromised or low-reputation domains, strongly supports the attack pattern of luring users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://adabaskimerkezi.com/upload/file/gasajulewoguni.pdf In PDF document text
    • https://activepymes.com/pub/file/89612917619.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16119c547a2ad2---rasasexoxisisezituwun.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd8b599a---surulupupa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee712f30df0---woditoguven.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd375bc810d---25401692345.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7mkem1mnvuivse5i6dpu72rks/gujakomapubemaximedilim.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1f12cf4c40330d8ee2e6bdb0f51f6107/64627986239.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/87156465269.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fufatifelogaxerepusaj.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/688814232d262cb0aaae06ac5ec39ad5/94228991453.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f919553e9---zezuxorebuxem.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/78634128894.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bdda5a82---43709100400.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/xobifejavavekodomosona.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/845725616.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088251abc004---bujozasunavozodimovu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/32689304c80d65f3f2995eada20badb1/kugopazodokeki.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/sutitebirapal.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/30599095036.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21ece491a---87529520489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=unduh+wiro+sableng+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_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 17880 bytes
SHA-256: 4bb71a7e26762b5928bad109184888f575afc5c766a516f2833509fee3b6ff01
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 11012 bytes
SHA-256: a61bcbf22e613176cf4bb31b2656c7781badb013828992c3ee90c38f8c37d9f2

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