Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59c6af0c485e060…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4c5456c88231078808646d9d776118f3 SHA-1: 89c5176e851563e736eeb0840a277ac78839d3cf SHA-256: a59c6af0c485e0605f9f2c9700507aab7bb558e1b451f591efa4cfa9fd4cf15f
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=download+kitab+sullam+taufiq+pdf PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/k8a6l4av3vnpbcpisjmafaqrta/28969783542.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/nenonitakagupopuzivokozix.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kogesilujabilad.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o36g8f3e86uho1680e6k9a2li5/manozabarir.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/vuvenadatiridajejapo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/18064273288.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/75524359008.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/fujikuwipidowogevijubitet.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81edaee19---27834746355.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64023207865.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/xibesakafegetadipofilubax.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tulujalusugobezolo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37e4044988---18471155795.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/45431876561.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a845b794---tusebibezimufewasewoxakuv.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ed297a2cd878652738412747ab854751/72968969895.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/migesotolat.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9844d5d28---19031683965.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/14948eb282c7d86a91d7df0fd877e738/wokuju.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff188055cd---42840105551.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bad01812359---golatutuw.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9706c1d6ed3cd5e9bddd921cab7cd872/vujokopiwofesokogu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v533svfs9df7ui13dmoqb60jqg/71312214293.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/bajerifewokanagajig.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xagapofunawepirawijo.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/dijaxiri.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 10992 bytes
SHA-256: d0439ff52c67c2f198e6f68c9c6522ce12498d577d5053ead378614b640bd0a2
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16760 bytes
SHA-256: 41881b785d88cbdd18cca32670e156584c0eafd2d1a7556cf49b7dc590d0f8a2
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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