Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fda5785ed54167…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffeb9fafaa8d30cb913d2057b94a2a0d SHA-1: b969cbfbdadf98c16f270f6cb8cea89607f4d391 SHA-256: f6fda5785ed54167f6e442790d3814385fcb5a8faa4d79f4dc33aef8a7cbb423
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript, while not fully analyzed, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://boek.se/bilder_umeny/File/podoxonikixuranuvasa.pdf In PDF document text
    • http://ruihuitax.com/files/file/62303926647.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/98480284667.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/noniwegijarigogazese.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/rujirovej.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/kazefidab.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/95193294007.pdfIn PDF document text
    • http://mdtrend.hu/files/file/77045464271.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/kemitupiwigelirafajimafu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/bilagom.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/89077624708.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/91664712751.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/masibe.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/beniwa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b22b2d952878349eed71872ee0e6cb0c/lajatunemoziniwazit.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tininoto.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdc10126c2711d857ea9fb29b9b671b6/kofuzoluxomugasu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/46720c57f33ed3e2bcf4ccb3b07e2506/53779875930.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fusuwigiwofutativinexawoz.pdfIn PDF document text
    • http://rayanchem.com/d/files/31509369932.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/pixoxagorejumafuzakoxikov.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xeloditajerurusivobunati.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/98541392966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+2021+update+apkPDF 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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 17536 bytes
SHA-256: 5280044b80616e5ed3f97d843f15bf8d205f60fe45467b38172ad888084173cd
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10760 bytes
SHA-256: 949ea8f96178d33139b42dbf01c19cd1b41f38b28aff8f8f8fce69ee1dc3faef

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