Malicious PDF — malware analysis report

Static analysis result for SHA-256 63270628fa843776…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 11:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1cd6ced9e0eabc0be84e863ef7e087a SHA-1: 657485c869f6269b692ab87ed525581c3f2bf387 SHA-256: 63270628fa84377606bae07bf52cc37dc758933c455778c024b8c6fda5d474d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a Google feedproxy URL with a 'snapchat download' term indicates a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ada171d6c---tupalozigumi.pdf In PDF document text
    • http://ride-on-earth.com/images/blog/file/37965324106.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0a75fb6c---boretolaboxuz.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/57369957858.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/17399148291.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/39187121586.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/33627646754.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f069662c---99161521097.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/ramerukivaru.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/duwotilabugaxalubogifera.pdfIn PDF document text
    • http://strandedtattoo.info/file/fogikediminonapinijer.pdfIn PDF document text
    • http://santeh.md/img/files/48212052480.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/maxuwisijuxilirumugojaf.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/morovemirurilomulogetesa.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/febiseronijutupaw.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/90978321519.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fipuxoposobomom.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/pevubatijapezizitamuwak.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/kesifeto.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35983182408.pdfIn PDF document text
    • https://kham.vn/userfiles/file/93328549962.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/87542577953.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/75431986849.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/37861726632.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/95522083153.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nodowakomamokubikikig.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/gefalujaginifekifukirino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=snapchat%2B%2B+for+android+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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 10580 bytes
SHA-256: 29be12296425d0cee26d634d2c38dba9a47732638761583a6e8463c569b22446
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 14620 bytes
SHA-256: e6f5fb520ca883cdf71853b5a9c1fd8bcbda0bd65d26667e7165e836c4205d49