Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efe9ccf5c6aec2c…

MALICIOUS

PDF

152.8 KB Created: 2021-09-18 04:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f12ecaacd3f96358ae0cd75d1ec21e3b SHA-1: 89fd9a23e045b04ddac25c4a9acd3928fa46b48c SHA-256: 0efe9ccf5c6aec2cd85573297f25d22fd1340bc4009c2833c7c209651b022859
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 https://smidgel.ru/uplcv?utm_term=android+memory+test PDF link annotation
    • http://rkenterprisesonline.com/FCKeditor/file/20161543723.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/20089407008.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sepubokogevaba.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/58810029130.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/givejubozaxip.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/28161972311.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f053b9922---99532349935.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/kukenadu.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/1712980155.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62447860418.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/81549592801.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zefufukavopexoj.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/fovetalokenatugabegax.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/37665062821.pdfIn PDF document text
    • http://www.centralperdana.com/file/23816598680.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39ba37d51---nalakufefekinufoteritipo.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/51547963216.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/17463947912.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kowabuvilosulewobenaja.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb9a6deda---52875382064.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/63214178742.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sidimelorojukexin.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/dorumedunizasarijani.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/48321093216.pdfIn PDF document text
    • https://people11people.gr/uploads/File/85363246552.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/zatagukolo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/75910371176.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_off0001f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3B2 10296 bytes
SHA-256: 06b9650d1c763feff88d7925eddd33e6a041a0f7795fd5d5fa1945bf7503d1c3
font_01_sfnt_off00020ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AE1 18876 bytes
SHA-256: 94f4f367dd4869d265f7d2d46b358f6ba182fee8c71f4ea792f2645355b4aaf3
font_02_sfnt_off00023cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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