Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18656305e35a3a3…

MALICIOUS

PDF

77.4 KB Created: 2021-07-19 11:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47853ebb4fa0bd185eff19078cd302d9 SHA-1: 11f4c5436481331a7b90f1222feb6d937b2a0f3f SHA-256: c18656305e35a3a360b42db7b4c068db130e69f8e8a4a135018db4dc76075f6b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the PDF structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/vosegitujesaro.pdf In PDF document text
    • http://tootooair.com/FileData/ckfinder/files/20210630_4775164956E444AF.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/liropowobawexowusober.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/65264322283.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/buzimudokivobuxa.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/zezada.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10cf07e88---wukolavesapekumifigulun.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b98060354---bagetalosobiraxuwoburu.pdfIn PDF document text
    • https://togeltop.net/contents//files/zoxesupawokuj.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21e2bec7d1---poneroxez.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/volibijinigukumusem.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xemebamekokubona.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/63849250263.pdfIn PDF document text
    • https://cmoretv.com/userfiles/6295712589.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/72273696692.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec05d8dcbd---xeroxawekugezedalusofim.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/zulovinokadokobaduv.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b61a4c8ce---vogenesogatuzejobasom.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/finofuwadukotop.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609510cf4846d---tanepigesimepakerezov.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91634088054.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/254d00ac6a9b8885f3b0a377c0fcf32f/xunalifi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vililuzup.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/18f842f8495a6ce75e5b6043c3496bdc/29915450082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=in+the+form+ofPDF 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_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 15948 bytes
SHA-256: cdfb5636471b37c7d0fbda7c1dffeb84b0f094f910953f8970e2bbcf5014e97e
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 9960 bytes
SHA-256: 54715e54d0011711d93635363f5ec857455f69bda04e7291cb9b2374d9a5e057

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