Malicious PDF — malware analysis report

Static analysis result for SHA-256 68130eb83f9a74c7…

MALICIOUS

PDF

93.1 KB Created: 2021-07-31 18:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4d1780482f3cde1775b8fee82a6a258 SHA-1: 3aa01f7b210645e17f3c64d5348f24b3d10580ef SHA-256: 68130eb83f9a74c781b53dcc2609b94c65d38709324cc4dd739cbce80752e500
104 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 and other disposable hosting, acting as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of download button lures suggests a deceptive intent. The primary goal appears to be tricking users into downloading a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://exmar.it/foto_fck/file/50635966325.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8ca46d8a---vidunejafe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2623de1c---mosivururivosafikaxi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/99220220169.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c2fcdbc2---76253377313.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/xutuwapisopumokuwupiro.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/widalosijodemenelinugeri.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b60c3ca3c---82818106870.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/taxajisidoledap.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/60710679935.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/95899760283.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/72440544636.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3932793489286abcb5a878d16d6be0ed/denifaganikizelevexorexa.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/ronotakomuwep.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3d1p43dl9u3vskrm8iga2hgmu3/15142546095.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/fuzukon.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/80023813266.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/71709041379.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/46314335334.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/9683645376.pdfIn PDF document text
    • https://badrivishal.com/media/89061720057.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd314b1abb7---41253609922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+program+a+tork+rz307+timerPDF 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_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 18736 bytes
SHA-256: b361c25c1dd0a70d36fdad99ac89bb5f4680bef64d2548572e80ee4b1339bf4c
font_02_sfnt_off00014c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1C 11204 bytes
SHA-256: 03980d346f46ab6182a4458b1e608f4d1cc1c98c4494503a5c086b1e87fe38bb