Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ff8099f8db130d…

MALICIOUS

PDF

83.5 KB Created: 2021-10-05 01:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 691bb1f458df775620ec926a82e4d2e3 SHA-1: 8876525bab6500753e9801e0cd74d374ebb37e86 SHA-256: 88ff8099f8db130dc3b4dc92d8119d91d4e53f88003b2d96221955a2000fe06d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://commonlawhouse.in/userfiles/file/vaditoloki.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/kumelagiverutomuge.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3d1f2ff2a---tetozipo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/28236936199.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/47042666529.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210930_174914.pdfIn PDF document text
    • https://hoppe.dk/files/mowevivejumegetijozodoter.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/55009635634.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/52881121989.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/39123060129.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/jexurejuzow.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/67186358399.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4b6bb8f9657801e6f2d5fcc843884295/kimamajikuxigadimuwufer.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090522142872.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/18674724292.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/56769591385.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vefizuribidi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/33892183348.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/maxaja.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/tajazojawesubesom.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/37329336888.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/51c05c2a69750c52e74fdf541a7371cf/perareridile.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e39e9c2a2---64373900613.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/zoliguwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=couchtuner+the+flashPDF 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 21492 bytes
SHA-256: 597348ae2d30ee4a6db609ebb215f994a89a543dbd3e79f9ec20dba6f00fdeb4
font_01_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 10472 bytes
SHA-256: 91bcd124cd4c0088f54689559886b2bdd44e25adc93f46662bb7f0a0673fb780
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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