Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdcd7d3e5b904c7…

MALICIOUS

PDF

98.7 KB Created: 2021-08-09 03:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d9d711ae1bd69df2c6b69e88a499dc74 SHA-1: f2aa724d6901bc047394b26b7d446f4c9b4a9629 SHA-256: 7fdcd7d3e5b904c77aa12afcd03a29248a97fe1ba03306654f9aade0b570671c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://alliance-ic.ru/uploads/file/xowikizaviboramek.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a84eb83c4---46014688241.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/84634953159.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/37217917327.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tefujegurimonozefuxivuwew.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/gobupidovibirid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2460efb2---91497137059.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/3510559215.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4c53e9f4dc970c19edd8994ae8da1af4/6919237372.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29a2a1188260af427bb640da521d46f8/46723855360.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/41266695688.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c25255bd4fa2ddf4df2df269bd6feccc/fujupilurutikezaveb.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/zudageso.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/71357875449.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/6a73775dd60f8d145b49f451dc3d1716/61235153224.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/21ca15acf72d35403c6d8aef717b339a/71669997099.pdfIn PDF document text
    • http://mamam.by/upload/File/file/nafinobezosi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5e719d17cdc9ef46efd2a34e75cf5f2c/sunuger.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210725/210725044145535050g74igv8xdaxv.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210619052703.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/229d83a9af672610b8519ea390b7a623/ripowifopixo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/piwelepiluxogovatagi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b05ba84a9---xeximurapiput.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160738569ed627---tibanaz.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/runanoxowakobe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86bbd3dad5---15942386428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=i+became+a+dog+2+walkthroughPDF link annotation
    • 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_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16408 bytes
SHA-256: 68aac6b08e030eb3960acc09ad6c297dd479302dc12d45c6b1823d88ac38f20d
font_01_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 10940 bytes
SHA-256: ca012f8f5290f8401e152b01cbb66ab4650d38edbffcca529428ed143c4fa59a
font_02_sfnt_off000163b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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