Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98e03d2a21f8f46…

MALICIOUS

PDF

86.7 KB Created: 2021-07-25 19:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c74ee50def4e3f52e54e557bf47314c SHA-1: c98999625a7368cfecb9cbf59b00b31688f3719f SHA-256: a98e03d2a21f8f4676127c01e849b0629ac17b87c74a7bb8adaf87812fcf5cc5
144 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious files. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable antivirus software, a strong indicator of malicious intent. While no scripts were directly extracted, the ML classifier and the presence of numerous URLs point towards a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://immobilieninvestors.eu/userfiles/file/jasakidamizuzafo.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bf9ecca92---gepanijowulejebuposenuva.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedufada.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202107011506_621146538.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071982a6ef5e---kamakederenumesaleno.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db26a754a72---28112168583.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e544c99ab---61764600419.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/fjdhn0hm4pb88u0g3277e4g285/71526589593.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0feadaaa875b9866b33b2268a4a85e76/letozugomegasi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tubckq5pcqqs0bl251hjv58to3/11664473410.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ef3c8f5d---nabusuwowowanibaxirokowe.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/77c651fbf26496574c8c3e7e34e8a4e5/pumutefasekafed.pdfIn PDF document text
    • http://cy2hand.com/userfiles/7430963513.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/17196995212.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r9m8g8rhpouo98o11rf8r9grd8/16727516982.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/tegovakenakuj.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/palos.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/teses.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/56db16f210caffea7acfeb919641715d/jaxolud.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fanubatuvogepunilu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8hrqr1pbkjjm96fljor45oebrb/logegazurazudir.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1a6ec1fb01a3ff7fc41a3f2b66ce0df5/58687847004.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bcfa09ff---tokugolitefokelavudejiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=epson+l3110+adjustment+program+free+download+2020PDF 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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 17784 bytes
SHA-256: 1289430ab774dca56fa6ee3305c0d7baffd5dfc154ba1c29769b3fde868059b2
font_01_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11512 bytes
SHA-256: 61c4a4faf5745284ef0c38838e25c49c2b1272a2fabd0215b2196e0dd73bb965
font_02_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.