Malicious PDF — malware analysis report

Static analysis result for SHA-256 9554adb9c42a557b…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 16:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d996591e76516bdf2c11384a99215ecc SHA-1: 46727a7e26b649d31cec57978ae5a532fa7b1c02 SHA-256: 9554adb9c42a557b7f0f30ff53092a2697ba523559b6fab02cd734a2f349e8dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=cheat+nxb+ninja+voltage+for+android PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/34a1c7f48eec602d3193ec901a1fa1fa/1042172812.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/3103191555.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65802550002.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gemegirififonopod.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/58470803418.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa37af15a---kikaderowewage.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/20447036920.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/98705876782.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/4655371011.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/nuvekaji.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/74705356386.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/noxixepagavawidefa.pdfIn PDF document text
    • http://julianina.dk/upload/file/xifebupemafesigifujosa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qbl077skcf2sbr05hvunodfpii/gunoleda.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kd4olehemf06hvh7f0tijaqgl9/zovozexegujapirakol.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614197275b8f0---petavametirobepovupof.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/76652960834.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6637pkmguom143tk9527lq2r61/lafafizodinetus.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210903073457.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rofalupubu.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/39480764066.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/kunibesamigop.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/sexesofetikil.pdfIn PDF document text
    • http://surausa.com/uploads/files/62299329577.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kozovogoretawuver.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 21656 bytes
SHA-256: 6ce674bf61bc53712efd4f859dd9cb58683c1f1df867a7b8cd0b83cc68f822f0
font_01_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 10932 bytes
SHA-256: e9a926f1a8754d0bafab81681985611a696e79d3c52ca5ce3063b14bedf56ac4
font_02_sfnt_off00013f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1