Malicious PDF — malware analysis report

Static analysis result for SHA-256 50328a16cef0299b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 00:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 155534c70f465af67395362fb3310b01 SHA-1: 39222fe8a3bd95d9a73d34ca3e2cfe884d054663 SHA-256: 50328a16cef0299b99d8bd04dcf59164a4909f1c8ef780810d4456931160b418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of external URIs and link farm heuristics confirms this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=mdl+recruitment+2019+pdf PDF link annotation
    • http://shield-in.com/userfiles/files/50225113453.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/90330444096.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d76e2e3558174a9d6f2e8521fcb87668/remapokajineko.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/90897256531.pdfIn PDF document text
    • http://kids-ex.com/77880835569.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/samonubonazemupaluge.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/beparejidikesezobuwa.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tabagotofup.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2e45509e8---podezabotofitoposera.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/40264471166.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/galepelaguzo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/p47h540mhihoap8u2507acqo8g/dadese.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/bagajolirazavefeboxapaje.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/23342670199.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5b1a6df4c4e34665fbf5c8260dacd08c/xuvoxujafasexuwujivubo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182da42b1b---39682743401.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7283b68b3a---vevulevezode.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3k1rhrto53mm9e2htfehi56ld/zekafuravomabisi.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/73919032502.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zijoxuzexumamavo.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/ratotigatexenesijo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9575223ee0---43514652465.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b26dc886a---34413856138.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/pufikimot.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10884 bytes
SHA-256: 8481da3bddc1f1319072ee15fe427a247f9fadef32b5a3df5c5206744e29f472
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 18632 bytes
SHA-256: c92d19094ceba88fc4d2844e40a95a22600668c9b994bce30bc6bdb8159cd904

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