Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf88c030083b06d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 04:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1758e5a9bfcbf5074fcbd80c9271b04 SHA-1: 7bc5bdbfa9b370840d351b779d4a666a8661e381 SHA-256: 5cf88c030083b06d3df394e9dc14f22b509f6ede2424b3e507c128f4f12b42bf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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=clonezilla+anleitung+pdf PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161152d2910c4d---fupenozosabir.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/11666843303.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41711697721.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/43638557826.pdfIn PDF document text
    • https://digiconelectronics.com/media/9599460732.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4f8140a3db3358ad7a4737a8f450deed/muleruweminuz.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/noderefow.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zuxoxoba.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/63258047006.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rabomeridadojefatima.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e93b5bb67---tosederodupaboxurolowuxa.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f65962020a2b418d8c0ddd6945b9d5d1/49689517465.pdfIn PDF document text
    • http://raczcsalad.hu/files/29279008756.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kigurubak.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/40707377034.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/wanegiboraba.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b12d2b23---13673200598.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/igenbdtnns19ajrmo87g50q8ep/botix.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/ketixedofuzud.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/79472707065.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f5f8bbf8ba64321a8ca1899c4f479e22/jesapizilaliteliwa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/22260808800.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/k1riuioarfqtvai5k1fr10nbuq/kegogixapimujene.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/93066097214.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/sewabefibegosiwiz.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/22548247766.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_off0000ba04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA04 17656 bytes
SHA-256: ec1af72c367f62c6b9d481dd68b412b851714f678b52bca381f5e48b49fe7ef0
font_01_sfnt_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 10596 bytes
SHA-256: 319ca4376a44c4e2e64d41509d33c9bdcd89fb8cceff821519e6b623b65f2d01
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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