Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5849e441a0ca5f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 10:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b757fc98b9101bf6cc3a1c6ae947abd SHA-1: e8b17e869471955b017fe3a816ba5376a34ac598 SHA-256: df5849e441a0ca5fe248b7f2ff995b6d18ed7662884c472b47d4ba5f4bab31c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://drafthe.ru/uplcv?utm_term=face+to+face+intermediate+workbook+second+edition+pdf PDF link annotation
    • http://studiogiovannone.com/userfiles/files/vevojatibof.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f901c0f734---67706152225.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/51760946740.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021080402133473499.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6br67ho34i64ulo4rkdk5m5tkm/63721152816.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xiximedu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5200770c0ec401777d1d4f206221f855/xolaxosetidako.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607419dca827b---zamepawuvidezad.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wepupuwabaviralogawifa.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wupujijakurirubo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5fd5f04---wakireximemo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/dd3c65a73ae576678ceccb45bdd81e44/sagawelu.pdfIn PDF document text
    • http://netflor.pl/upload/File/tutiraluguk.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dexojeduguvobefipiji.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/jaziz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fc16cb8de---34306279032.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160791d1346518---ziwaxukalabonusutikag.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/12441893295.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/mujibexanolozisexajo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25982bcad---nesuzilaketejepa.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/51687407471.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075768b5138d---sipobufuferujugawitaza.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c625e2e4470---98891805056.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612174ca6659f---lawurirav.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/481ecb55ae09966c377c2e2f296e1d51/48353853677.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_off0000c3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CC 11028 bytes
SHA-256: 077b57d4faa1d25ecf1e9838cec6e76343a5b4a2d2514e2642e542f82e2d5d9b
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 16584 bytes
SHA-256: 79ec10474ccfcd5f1824d51a563f13359d6ebd28f28ec1f7885866de05903931
font_02_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1