Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c0914d643e93a2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82c975080033c2dde7a92d9c06a3d0f5 SHA-1: a31105259de5862362c89f0718a90380100ac249 SHA-256: 67c0914d643e93a2b1a0b897f2aa843d50442841b3bb419396e6dc972d82551a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to download other PDF files from compromised WordPress sites, likely as part of a phishing or malware distribution scheme. The presence of multiple external URIs and the use of compromised CMS uploads strongly suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://archism.ru/uplcv?utm_term=converter+pdf+em+doc+word+gratuito PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d85401ac---34980673148.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/vapubemiwabexanar.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd50984a5---3958547019.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dd12a8d33af3295c21f78fc220d2fc98/pexulovijur.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/92303092650.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/dimavegokoriworidojus.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/winuxemolitafudinus.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac0b1579a131a2e2bf6de41790b0e532/44136845109.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a9b8a9503---dopularikudi.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/wevifeb.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jegph9iuamjjhl34agup6vb2uc/14060215824.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa799f4d8---panurobelovifebanojuvexo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa392950c---49884632673.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f180b6745---zikufojasori.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c4f7d517---57615898254.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db442a1886---lijaxoxige.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/wibinudamu.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tegubop.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/cd8d073414c0db13a7def75fa5e2b36f/sibinanone.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/jifokek.pdfIn PDF document text
    • http://sswjeans.com/files/55813203419.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/4025299404.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c4430db7---ruwukijamakaxuxaxetatara.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/55596293278.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/571e32a46e015162f917bcbcb63d8daf/mufiruwironudeno.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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17140 bytes
SHA-256: 3186e8290f51dc129347b7ef75fe9f51616c53cd2461d7a791e8793b2ac9d17d
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11032 bytes
SHA-256: ecef4242e819f6737f2e04b08215c8c395498dd34451e773f63d1287aa94a6fe

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