Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7c3fabc49cf1e2…

MALICIOUS

PDF

102.2 KB Created: 2021-07-07 14:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b687b3ca2c462c838b07c8e926c01787 SHA-1: 861dc2bb13c2c479f92a944723d36cea423bc20c SHA-256: 9e7c3fabc49cf1e288b9c9e404760aff5ea19dc653ef255d931eb9b21819a1f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e25d32fc3---98596433740.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b42855504---vilur.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jebedabaxafupotab.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/xinamizape.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181750.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/aa1ed317fbaeb79a4bad70fcad448839/pukofefogizaz.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa7d3cc97---dorazemefokadetazum.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e99b5f56---bovituwexupaxofi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e898c552c4---mozepadap.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a319c2854bf579e0edab5bcd9a6b47f9/rexoz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089988332daa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c78d5fe2387db3a482015b77d151ef59/96381067186.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/65527820715.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/govopuzif.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1bd509ed---buzivub.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/tunebiw.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/75511482965.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/95909889210.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e7bdac5f---nonemusu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55f12c65b---sevotoduravitodi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077871b5a601---83813117686.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a280d24a655---57421661580.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5433cde58---sezotepobajimukekulof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bedford+county+courthousePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ede1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEDE1 20272 bytes
SHA-256: 27d5f65c91f84178334f6718570b3bf5124e90b07ddbb703e315c935f7e56f13
font_01_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 24284 bytes
SHA-256: 27d75d8f4f3bcc1cad379932322590daee5d184ad0c596ec1fda5713fd4781e0
font_02_sfnt_off00014c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001642d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642D 10540 bytes
SHA-256: f73ba2556c778f4cdeb0eb4cbc4360e31899120a227579ed1cfbe45d6e9ff5a3
font_04_sfnt_off00017c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2E 3128 bytes
SHA-256: 40761b014aa904fa60cc5613d488611c568bd5c192141e2aeec42247cdc6931b

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