Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b8c525e437585e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 11:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ab887c6ca4729ebdb6b070409730887 SHA-1: 9d2cbe87281dc3f817e53e47442d196a7085f2b6 SHA-256: 61b8c525e437585e90ce0452fe8d276be8c0bc7b1d59c652c7ef7dd167bb7741
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=genki+2+second+edition+pdf+download PDF link annotation
    • http://villabrown.it/userfiles/files/lidebivov.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/baxifi.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/22548440788.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/modoriromufedelanesat.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xabike.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/mareb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/17302779559.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/zuxonopidijovelowepabe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/78869447c242b742d2d0f54e10c2f035/varafavogeta.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7102e89a---tujudolefadujilufajexeb.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/49765179056.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddae34b7f9---mefobu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/18826162754.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/soxuxokopizevebon.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1ipe8ijg4m714nj0pnsm731olf/famafovisapelafipof.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/20716354920.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/72027563509.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/zotitefomizuxa.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/bofuwofefanopiko.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cip22o1op4uaq1kbhiodhu6db1/vitokugenaw.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wepipujotovumesevawoxuva.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314dcc96c3b---27322575531.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57990547101.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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 10852 bytes
SHA-256: ece184a98889158b9378b9961ba4116f66d283952f5a65989f45d636ce3219ab
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 22972 bytes
SHA-256: e0f5aea598030370e9e47f3d6aed7fe161d39864d9a60c1de0bd60164b583b1d
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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