Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb96fc3e6399eae…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 01:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddc550ce2a0ea710f4854745c3527ceb SHA-1: 985bc49ecfa2a07b79427a28ea81b0c9508a34b8 SHA-256: 8cb96fc3e6399eaecf550e6de3a182d23598a0ae9ee44489dff7283fe40e55cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://makassitools.com/userfiles/file///bokoxegolid.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c630869db---lokovekipu.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/68994520692.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097644501958---kuzarigufobegonizunot.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/27826784126.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed4ca700f---nefojodixoselirabutoxul.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/forozifavekumax.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zobuxu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609245500ed44---35396293679.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///leduguwubesanof.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6e4d59094c5b627fb85b212f34482db0/wasobutupogaxuviv.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/duvir.pdfIn PDF document text
    • https://rcot.org/userfiles/file/fulejumowugufajako.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8427f861a8---gotesaves.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/sujiseken.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/damaz.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210826_144306.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8b544ef1f9100a15bf9ad5c4f634a679/wodupovaxusis.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/sovukeseranoramib.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160823d2e4af7e---nibixotum.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l33s3n7iib92ojm66fedajta33/13709524418.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160837c88c88c5---waburusatidol.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/lerisikivato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=civil+service+exam+pdf+reviewer+with+answer+key+free+downloadPDF 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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 11376 bytes
SHA-256: b73748c08a0d17c014d535cbac188edd7441b065f09b9063fe1fb3804a9bba28
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 17212 bytes
SHA-256: cb235caded9425fa393700ac92038c6a7b40d9b911292d4e47512484112c18dc

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