Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef35680e8fbec50b…

MALICIOUS

PDF

96.2 KB Created: 2021-09-20 09:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9896171e2fb681813c2883f20a96127 SHA-1: f43af55f8d72fa7872541f48a0ec7b668aad2a63 SHA-256: ef35680e8fbec50bce7fce1989da6756293147b67804f686b2aff7ffa4929f1e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for redirection. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is a pretext to trick users into believing there are new or changed banking instructions. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://drafthe.ru/uplcv?utm_term=caldav+sync+free+beta PDF link annotation
    • http://intertribo.sk/files/sabufudidewodokojoburedit.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/24338800559.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/woneleveluketuguvebopepis.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/dumemu.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://samwha.com/upload/userfiles/file/44312388031.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1278858a---98547051551.pdfIn PDF document text
    • https://arerp.kr/data/file///dawaxuduxezojigawabap.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/lorikagurolejegoke.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/55125797979.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/45500482609.pdfIn PDF document text
    • https://lazerom.pro/media/file/97454158770.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gejim.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613067ea9dabd---93716971468.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/rejele.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/59319937843.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210918155721.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/4916118308.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/47297423073.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210920123555.pdfIn PDF document text
    • http://www.heksan.com.pl/file/26046486017.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/bopijidofixodigaz.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxutejebelopimugixepuji.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421784e53a3---5614329217.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/38801002511.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_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 20268 bytes
SHA-256: e286d4f25eb06c1301842e6bca829071693938192aae5f74d154885fd80a401c
font_01_sfnt_off000142a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB9 10608 bytes
SHA-256: 94ab81062897ce48ce887fd1b976baea625208498f2acb1f95e5af8874e50d70

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