Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae9a2d686de67e2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 00:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 720ade31652897170757524e65e2090f SHA-1: 709b59a80e819bb0f89f3b057e2ea345b536d552 SHA-256: eae9a2d686de67e257f2b3e6345a2eabfde7536d8c579ae99a81d1690e1fa84b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to download further malicious content, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6095e8fc9433789824b4a025410e4773/senadumasedopoxabej.pdf In PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905065004.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3899d46f---bedovukopugususef.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/letonezusuvurenurolirimiv.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/riwesaboxopuxepi.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/newobunasiwerarud.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/77599242636.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sigusowolupasawa.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/43075766942.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/temak.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vsa4etokut3gjjh20aiao8esjb/dutunorudejuwijame.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jezomesedosomuvup.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210918031640038677wtf0nl.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/bavejudowa.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/29965459982.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/gakulizumifojanadafuvufe.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/90985848736.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8fb7fe76a87b3758b529feb7c2bd24c9/jikazibabavazififelajatuk.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/72810995964.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dikajopujokakobemuvelu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/20775120860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ca55+quad+core+processorPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/54986166790.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 18396 bytes
SHA-256: c80acc587aff80203a09757ac8411a52dae9cd41f2e0a50d41651af322a4a3db
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 10580 bytes
SHA-256: 8e64239f62b125f5814b7b4854466ff0dcb8389fd2d1c953a41709828a8b4b73