Malicious PDF — malware analysis report

Static analysis result for SHA-256 63df2c1beb19872f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfb2418f72efc09b54b1ad64eaacd0cc SHA-1: bc7ddb970ae0ad717abfbddcd287b39051d24cfd SHA-256: 63df2c1beb19872f14e8e7f06180efb1b2e2cfff487eaa37c9ba27c77a906715
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=how+to+set+android+to+factory+settings PDF link annotation
    • http://radio-salsa.fr/php/rs/filesupload/file/renamogekidijudital.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109121354246908.pdfIn PDF document text
    • http://a899.net/userfiles/file/lefiralupewimumekifev.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wejuxanoxumuwemasiz.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/diboxotajuw.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/1747447674.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161437235d6ce2---wilelipopipinagilajog.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/97771588977.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/30300051035.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/bezibovesezosameke.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14920836e---lugoxoreruw.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904200537.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/todosokuk.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lomabesisubezoja.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/71971292854.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/11690920957.pdfIn PDF document text
    • http://chinalabware.es/d/files/64618041562.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210909_718463AA4CA5E58A.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2fd680cb34a1583082c8796ed0104257/kibazijejerezuzamu.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/tadajopejalapokama.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/1561818345.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wuvonubabavedevuxi.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 17708 bytes
SHA-256: 132378d9622c3245662dc8ed4b284df968b192ccbec172b0856bc5f512fd67e5
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 10796 bytes
SHA-256: d3c478380d33054c728a066265563592d62312edc550e4ae6c7f7ff50dbe98fa
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1