Malicious PDF — malware analysis report

Static analysis result for SHA-256 3468893aef104d6e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0c0e2de92dd90072483751ab7779e9e4 SHA-1: f492a2ceed5c4a9b49660614f73c7bd37b601781 SHA-256: 3468893aef104d6e7fdef66a68fcd11afa19d1a2d11e0ea3a4b8f1aafc6b0f9a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9933

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=create+flutter+apk PDF link annotation
    • http://nitecoreromania.ro/files/file/24708883571.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/jegunupefewolaxiwulokepug.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mikamemexatajiwejebon.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138164bed5dc---telexope.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/77239941763.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/bapaniteni.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5df73ad1---xawuruxafakivafumogol.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/47470451226.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/67001405402.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/15179698629.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210913/files/20210913215800.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kasarovafevuxajuxu.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/kanedaditilomoda.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/89318034092.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zosenodakotavolexavaza.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/govasopog.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/faroz.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/53905790436.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/867aa65c2a6262ef1cd1eb59e27d10d6/29958952515.pdfIn PDF document text
    • http://geotersrl.it/file/4034994971.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/56880409568.pdfIn PDF document text
    • http://muszempilla.com/files/file/fotixixavugojiso.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/27928227735.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/5847323194.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 21944 bytes
SHA-256: c726caa54ea47a05e1c2de5a3de9bd956d90d6b2f56de74cd20bf696c8faaaa3
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 1756 bytes
SHA-256: 4f0698999f8174c65e65ad3ef86f35a96ae212e4c8c5af369f37814a3c245102
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 10092 bytes
SHA-256: 6edbf84d34f89badc2c5079da67cb450c1a07f97fed65a6bdcc6e973b466b7b4

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