Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6191cfdf4d3da1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 12:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4205d22ce2b61c0634a7133c2a5f6e68 SHA-1: 56230e6c8c07fd09e7b0dfad8fdbf0c634f46d3b SHA-256: bf6191cfdf4d3da1238931a53d834b0c6b9535033efbe944e7d874b3af168276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://braindevelopmentmaps.org/userfiles/files/pazuwatekasuzu.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7e22a476c19248d038d2c1b7addb8a5/makorofewipotazuwiluta.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/12786071910.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/keluximof.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/84727547455.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tobebarezuxemega.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/34224865711.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iig7i2h9vtf2a0rai84trtfic7/33673460022.pdfIn PDF document text
    • http://marymo.ru/uploads/files/sajanutalorukebovolimubi.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/gokarufubak.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/togagesaja.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/tixamepapufem.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/64984694220.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/csn1jqkck71ml6lkh41eh5mmr2/gimoja.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/30132987131.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb046c504---voxolipeva.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210917_C46D9E098B9D48E1.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/petekem.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32129851895.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/torop.pdfIn PDF document text
    • http://knipia.com/userfiles/file/96523515449.pdfIn PDF document text
    • http://ux-school.ru/files/files/51962380061.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210904020217742483sye4c.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8fa293ec85ba5074346666c2cad847bf/wufuzafuwubenigisuv.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/16904729838.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091802280882.pdfIn PDF document text
    • http://kalikraft.com/images/file/86732717511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+hate+u+give+pdf+chapter+1PDF 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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 16368 bytes
SHA-256: f55eca1301741f1078483f84d1918e53e44a2f546883d1b11135daa852f69df2
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10640 bytes
SHA-256: 92246fbaac37c9af21971f98b16a6f1bf4b19bfabaee2d8acb0b51ea42eb0c83

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