Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb52f2de252ff6ab…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 092999e94e71936306a359ea09af0e1d SHA-1: 3a730e6981048841929839c37a0d211f9c048a15 SHA-256: cb52f2de252ff6ab9fd92f9cc9e74d6cb132bc54653574499e86d1aa13eaf98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=jersey+shore+family+vacation+watch PDF link annotation
    • https://machinex-machines.com/UserFiles/File/vaxubasifar.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289a70311a---xaburulubizamer.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fexikoruvi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5fd5e7235d9485b214cfa7cb237697b1/wemijubijosefaperixirenuv.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/18487074076.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/5082852589.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1cmik7b6mjgpb6tsrvpno4qi96/56775013076.pdfIn PDF document text
    • http://ashioke.com/images/library/File/botutotixikewira.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/650eb7eaqlmttnvfaj2pakuqsb/47373735857.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/24949219301.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb2adaa18---vosuvologodakatuwevibiw.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gudebulelaja.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/85b7989265c5f20ad12c37430659dbf8/mukaredeburagawukefitim.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/bevukovuvadujunixaxu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a99dcd618---94262007751.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/cd5fhq7e0hkdss0o4criaggp84/mudofefubabib.pdfIn PDF document text
    • https://lesura.net/userfiles/file/49055071108.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/tidozepiposin.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0b733b6ec---76370103908.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125209359394---nuwulopoxidosetunuz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735da3b9656---ludesotiremipekuvib.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/fufujafomuruvixutuda.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wubaluvafilubijavikopula.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 15968 bytes
SHA-256: 61586aa5aa37ce8c6781d6e84c193decf5b8cef743c1bedadd43f94c6b4ad063
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 10856 bytes
SHA-256: 0e7da7084966695c9e3a2f6cec71e9e72ecf897a59f241d7e724e2868b60dcef

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