Malicious PDF — malware analysis report

Static analysis result for SHA-256 4800b023fd06dfb6…

MALICIOUS

PDF

72.6 KB Created: 2021-08-16 00:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40c7ab1100df051fadeb22fdef802404 SHA-1: 30acf889fb8c52afe6b9160754f7041d983b2543 SHA-256: 4800b023fd06dfb65660179fd3407f21e44faa95016478533e9626bafa29d4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it is likely a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://chcial.ru/uplcv?utm_term=blaupunkt+dab+%2F+fm+digital+clock+radio+-+ne-6006 PDF link annotation
    • https://pmcp-avac.com/files/upload-ckfinder/files/16088082510.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfb1144eb---ruxiwibikojobipudevunaxa.pdfIn PDF document text
    • http://sakem.org/userfiles/files/riwopanakigizoleke.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/42997804509.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/wituveluti.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160881ebfd6fea---60649441065.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k3ii0sfjp70sjaglcg826aikc0/kosujomaxozako.pdfIn PDF document text
    • https://zold-kommando.hu/files/4814412768.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bc6e9110c4b9fc2a1cb9fe089bce8da9/jogakakijabapis.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zomusujawopurimubeludule.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jizatepezunogenazepu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/10416028004.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jagenukawapib.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d4d28fb9---35175731193.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c412128ae4d---34267423725.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f6cfd4dd773808238f40f33b1e1e7f4a/zajugewutopafizok.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/jotaruladafi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/88997816349.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/11428025518.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb5909cb4af5ac9646c77cce7acaa938/pelulogotowem.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/88294296483.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_off0000b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 15808 bytes
SHA-256: a88dd1eb2fc1e747895a053378c2b65f3cca49b052ed4f7a2b06a1f1f67b15c9
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 11540 bytes
SHA-256: fbba8959be4f44b1dec5e0e788a9746da930353215cec8ab5a87e7c2281ee04c

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