Malicious PDF — malware analysis report

Static analysis result for SHA-256 0383ac4e53ef065b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 22:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2176e0fdd57c7acb906fdc3d4290ba2f SHA-1: ee5ea801505dafb41985cda7abe621b5fa8499ea SHA-256: 0383ac4e53ef065b0e25c5366be7ed755609fc1cd7ffc65c675cfd34fcbcb3af
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=games+for+mobile+android PDF link annotation
    • http://fuyu.010bi.com/ckfinder/userfiles/files/vasizevizafiselazosasigu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090801535752.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/94036439369.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42711604409.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/purefoxoj.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/gadotuxin.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140147de947e---bawopexetevoxomi.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/kenulasezuji.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/dupisum.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mc81vcpr1q15po87c0k9rssgbk/vugirewoxolomisik.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/wivuxidijo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc8b22704---dewugenazemavetufutuser.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/nabawuwopagowojalusode.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/8136862651.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/mawizutunevifoxonet.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/70563692479.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/29596913673.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d630de420980587d47439d1433e14e20/55068296889.pdfIn PDF document text
    • http://gewald.ru/content/Files/80995869030.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/37932528108.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8e033c29a80ae5517ab3de6ea5e2e3d3/wudijafuviwabesezori.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nodasudireko.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wojalakakadufe.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mewumutepos.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/rotolonanozibujumik.pdfIn PDF document text
    • http://centronegozi.com/public/nipimekasogorutenumuwusew.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10596 bytes
SHA-256: 90004aadf8edd523643cc241c293bb87352cac6fe0dda0239718c60d8e71e4df
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16748 bytes
SHA-256: 8d93786316585920ca9d292f25791dd0a071af720ec101e568834189564a25b4
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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