Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e99e034c53047a6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 07:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 477bc99ae1c5dc317a14694412f3200f SHA-1: 1c0eff7a2dd19ace72f626563272a8cd9bb3de13 SHA-256: 5e99e034c53047a6a6a0e52d4d333e6a990bb133fd41ba866e14f28f36d3c9de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent, likely for phishing or malware delivery. The ClamAV detection as Pdf.Phishing.Trojan reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://cambodiaangkorhomestay.com/userfiles/file/37324319031.pdf In PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigigibisimatizuzopo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9351fa9c545d5c162ba0a2bd44c29c96/53013130229.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nebosolobujuvemupotu.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/84011207263.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/65363849235.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/filogiku.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/dituv.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/58909733992.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebabb1ff5---82957539563.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c974bbf3---rewezijulavibasexowag.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/savopawivofinokixanige.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mevupimulawatuwawor.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/sivilovokoralugulinir.pdfIn PDF document text
    • https://nexapos.com/upload/files/45671992227.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/mamuxor.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16134220e3da53---lonemewedowovoguroxo.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vanefisuxenalaseliwu.pdfIn PDF document text
    • https://majubesar.org/contents/files/karozu.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/bodevad.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/72262941113.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mozaxi.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sugikuvixadedere.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/jadarogu.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/16652884494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=porn+android+games+downloadPDF 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_off0000b63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 14848 bytes
SHA-256: 1a92d310b0f7bd3a991e44d9e0b6404adbb1bb9f5d04a2df5bdf5f88df842505
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10580 bytes
SHA-256: 1567c09beac417bd29094ea74a5acc18279b64fc0de9dda072974a9a65a89582

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