Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c2e8d358e78a0d…

MALICIOUS

PDF

87.6 KB Created: 2021-10-05 18:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c03b2d8c238cb9b7c2c48ed8c556af2 SHA-1: a5c24b99696eb1462b090d3615870bb590af49b1 SHA-256: 57c2e8d358e78a0da744cb362a8cd582c8e1fb6bb746772cc6f4fab55f9041f2
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure and embedded URLs point towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://eros-arena-reutlingen.de/eros/userfiles/file/tuwozev.pdf In PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/32279687598.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/renepulemalatefo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/36965918376.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/18321194023.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/65338794153.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ad1dad5472---22753325566.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/68205054703.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/99511812070.pdfIn PDF document text
    • https://hobbypet.cz/files/file/wenezegikeloxelitam.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/40829159837.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c2d4b959ad0e66beeb081263ab6a5633/pemerufodubonala.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f3a87845---dubapusixakotuli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543c177f34e---10158815010.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/99067387618.pdfIn PDF document text
    • https://kueapem.com/contents/files/jevefamozazomasuvadupupul.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/kikisupuxudelobetoganazi.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/50226605134.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109260159436803.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/25990708542.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///mefozowajidopodunosuxujil.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/45860838058.pdfIn PDF document text
    • http://santabruna.cl/upload/file/11739680270.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/lalisumireluteloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=add+a+gradient+in+photoshopPDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 18360 bytes
SHA-256: 59f323b18a6b5d8f654ec350df7773afca3d8a84a3eaa57fbaf7650dbcefbf98
font_01_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 10604 bytes
SHA-256: 6fba61f04352477ecc6be365f1ddc0191c6bd534c52fb5cf0fdf368a0b4ce290
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1