Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8053a8b7e229a0f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 04:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12caea2a42f4a7d715ad42d7fe2a0b18 SHA-1: a99f4effa047af4aee6993b81255977b209793fe SHA-256: b8053a8b7e229a0f066e18abfce84fad33f7153641b836f1d5d22757397c796b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of a URL with a 'utm_term' parameter further supports the idea of a targeted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=endnote+x9+word+2019 PDF link annotation
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48751664626.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/kamibuzivaserufitegirimu.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/26215400616.pdfIn PDF document text
    • http://lj-group.cn/upload/files/29023327462.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/74849035767.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/zusazorasutupevurafepar.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/55647814928.pdfIn PDF document text
    • http://lovesenergy.com/file/36982612532.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b35cfebef8140eb508187417b39deced/jakanaderuvorif.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d8605e99---50201819275.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/75182187188.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tirimomidoluzak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nunebak.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/denapufibabagaxig.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/bozafaresekexetemenaf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160883fed356d5---petoropopepuzarun.pdfIn PDF document text
    • https://austarpharma.com/upload/files/56517990400.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f75c4d949---wetuju.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7c1f2374d---xavuzazijovopula.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb2718464---85664883145.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/gabotov.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/54eea44447fef602a22946f3cd3ba56f/viferi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/22520390187.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b8a98f80c915b99458c298d4e42bd3cc/1526003747.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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 21236 bytes
SHA-256: eed632fadb3f430df0d7bf1d6c45a3c4f1fb788a78b4de1533ac19c5a2e26d6a
font_01_sfnt_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 10404 bytes
SHA-256: 3dfccfa908b44645084e4d4a38e93cc03ed69399231acf18c284173c8f32b19c
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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