Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efcfd6c634efbb3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 00:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7948bd64ec62db231f9c08ef53034f16 SHA-1: b5553a76f2d2c2a4930ca4e102e149a1d80294ea SHA-256: 2efcfd6c634efbb3a300307a15e409be00485b10fb912406058d1a91f81a69a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, and the PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories. This suggests the PDF is designed to manipulate search engine results or redirect users to potentially malicious content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a63ae742bd85b8824f94f95b1a1e48cc/2009015951.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/43073767653.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607435540d1be---48584018033.pdfIn PDF document text
    • http://tid.vn/upload/files/88820298064.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/tegasesu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6ctqefq71c0t0leg562s1be016/38648001290.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/vubupivoxenofatozud.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/zoxemokubapotevikizuru.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g036f34bk6i6jnt6unmgm3m576/wigok.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/16b317579f1b4b55c6761b244a9da5b3/28553237334.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2567466533---pasivuzadelavubukexeze.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nefevufot.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mpvgn0n639gtp2qkuc6erld9q0/dewusajenodobudufaxasat.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/poxevudivupimeji.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/38369224739.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160862f3b040a2---fuvuvonekajetavoduwi.pdfIn PDF document text
    • http://chromavials.com/d/files/91607080100.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/zozuzomakilalunuti.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fofeforuruluvapevo.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/toxinoxexenajokazu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dd690a8154f1b8f4c449bbb8fca5e42a/74361524223.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fomofoperisab.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/benutoloma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2006+nissan+sentra+service+manual+pdfPDF 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 17544 bytes
SHA-256: 691564d65c29706bae3dd9eb23d844fc43bdbd5e80c4296fcba5bb90c1049d88
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 11140 bytes
SHA-256: ebb738c0a6d88e9dea8f06fe7ffd66efb7106ff5d74335e238d8a0fb8d2a9b35