Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c53cf6d7f6cea37…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8d14c7d062bc8b870b081ef523f376c SHA-1: 29f403c05066875d67eff4001f0c0580ce74a299 SHA-256: 6c53cf6d7f6cea37b926f803ba87fe5327cc62588a24154448751c1e826119e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://archism.ru/uplcv?utm_term=how+much+does+it+cost+to+replace+spark+plugs+and+coil+packs PDF link annotation
    • http://usmleworkout.com/files/file/35339933190.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kejuxekitifepojisixugo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57713b416---raxavurojeweveziri.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d263bfb06508d9e30278f11e35fba337/webepusatakuvepoparuler.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/85161325856.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/dajonowog.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f95c63cf28f580359dd70dcbb4a822de/97357939530.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/16981346319.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2b66855f7e12181355504bd1e31466b3/tonule.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/liworusejixolosabisux.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/10971927255.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/74277549062.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/10514240853.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210824104257.pdfIn PDF document text
    • https://fototipia.hu/files/files/83927046974.pdfIn PDF document text
    • https://termofriz.rs//files/vopesikokajibepudelezal.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/55808925703.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/51413766429.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/89012336713.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/negefapikimip.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6c2hs908327l6e9q58rvnpe9g3/17332291104.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/borosik.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/gatujoxovagiwujosus.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/8100011859.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nositakagefeduwefurufej.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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 11228 bytes
SHA-256: 007c2dc8e7483a318ca309892db58eb9e9482672d8c5237e5b9c4fa6b26a93db
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 17068 bytes
SHA-256: 36037f6b72afaf159aa05fc41c4fd9e07754d09e47f55a59ec980476ebe62ae7

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