Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fa1767e1dba0ba…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 06:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a12fadfe19ac6bc1614bacc560c7c470 SHA-1: a07063b5bb74f6c0e1defd1cfd8248ada62a6f48 SHA-256: e0fa1767e1dba0ba6f2171e04aa61f0c56abac1ae803365d9e39a1d342e949ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://sreema.org/FCKeditor/file/xepamorugolafetimuv.pdf In PDF document text
    • https://vilus.cz/userfiles/file/nolunikewarixot.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135518d1aee5---xiriwisonukakinasikejuse.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13575292028.pdfIn PDF document text
    • http://consade.com/userfiles/file/larovujid.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/dekigamufotuvovidu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/beragavokipixerigitak.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613268c639c35---47439355241.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vulimuvawobekibuzokodiv.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/puforekudesibovij.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/22912319595.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/56865146031.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nonotofozonomuwemopedod.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/70133280486.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fejexalilowekadopiza.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134476e8f008---20634173079.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f78ee9163---temozagagogenopos.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/pawirisul.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fibemewebasoj.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/minobubofanedi.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/jodibodarofoj.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/43422221138.pdfIn PDF document text
    • https://wittnebel.dk/file/linadesukixumuj.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/58207372302.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385df181e7e---fijukige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+apk+on+smart+tvPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 10564 bytes
SHA-256: 54e692824460c42fbf3fea27c041a4d9da1100b90d37ca09fc45e1e6bb5cecf1
font_02_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 15500 bytes
SHA-256: bee3bd69b7ef7199aaf2ca91fb61667b7f8904d95de6a3dc90993c2d14f49994
font_03_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 17860 bytes
SHA-256: 8cd89fda782478d393b1bc05ed52ae01e69bc60f3aa38b0a6d37de1ff2800f2c

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