Malicious PDF — malware analysis report

Static analysis result for SHA-256 999c2bfb1861abc9…

MALICIOUS

PDF

86.7 KB Created: 2021-09-24 11:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 120a5fada5deb82229ce0c5bfe414ddf SHA-1: 5ca85c03c799998b66de1612cc36ddfc8e5d4a64 SHA-256: 999c2bfb1861abc9272f32c82c4173da75abc234e0e1a8432892ee9f45b08e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host and redirect to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chafewyuok.handysociality.com/upload/files/debafezuwo.pdf In PDF document text
    • http://dpholding.ru/uploads/files/44307061796.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335661e1923---zujoziwesovafifugugidozox.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2377b68---fidekumonozefenodal.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kufidegizej.pdfIn PDF document text
    • http://muszempilla.com/files/file/78834380809.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/medugavozevomasibubuten.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141564d42251---kimotujumitelagiwotugozal.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b709a61db1---sezolufuf.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/78922359527.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/28496876077.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/29308109632.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143835fdfd75---24886716359.pdfIn PDF document text
    • http://moneymaker-gold.de/files/30113176081.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090917284473499.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/90033431303.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/80711795105.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33216553546.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/folazawesus.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/mutuvemide.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/silolijokig.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/81559083462.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/70471847089.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/vexelarunivegefutixeraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=good+multiplayer+games+androidPDF 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_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10988 bytes
SHA-256: b27554e450fb8e326334268c2ef9460d88e234be43550a1061fcc6a94704b2c4
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 16736 bytes
SHA-256: 5dfa7d3bae5c4c787488aa302c30b50d4a0b76a7d07ddcb9154c3f6b3e0eca5d
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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