Malicious PDF — malware analysis report

Static analysis result for SHA-256 207b976f76de27db…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 05:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96f74b0dd99eee61b635bc843b5978a8 SHA-1: 0741f108f311523eaa9dbfc2bfb2f219eb7d753a SHA-256: 207b976f76de27db4ff88e3bb39f9028fedfacb2547847f8ace19cd8092bd0d1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to potentially malicious content or for SEO manipulation. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=psychopathia+sexualis+deutsch+pdf PDF link annotation
    • http://jeansresource.com/js/ckfinder/userfiles/files/32991114791.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7a095ef4b6894a40514b0eea0779f3f2.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/muzupabemuborabinaxigere.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1035a7f8be18fae53d5dffea93dac8/majevukeduk.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/82411011239.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/jixoka.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bilosolo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745cf816f9b---rudebababuxunanagonupaned.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/karagixujepo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc3af3262---nitonaz.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/10038069578.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/52822266413.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/lewamaresemojejiba.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5hq884leuf9ckabudaqgftagjk/8382708610.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/14917946266.pdfIn PDF document text
    • http://texmet.pl/userimages/file/51355812919.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/47182859129.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/37349a041ad8069207594f5ddf6d0e98/87363684878.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/67285074350.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/raxibinotijopivido.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ca2a7892---71415437563.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/wivipexefude.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ngfi8ch9rkioi81ooapeajnbkk/52836041866.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8f867f13---fudotigezivedi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d718f0de---zimibunogelibemisexad.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 19060 bytes
SHA-256: 267a28f844278f2c281f2f684acbff41f73635a5f378f908b222d021eba94cb4
font_01_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10832 bytes
SHA-256: 381cd997bfee14bd729b057183ecba41bf177395f1cead02a5adb4593461c393

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