Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c730dd138b01a1…

MALICIOUS

PDF

102.9 KB Created: 2021-09-11 04:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6816fcb12f4a7cf72af419b0a432edf0 SHA-1: b3069763b21aedcfd0ce0e5beb258c4f1b23734d SHA-256: 35c730dd138b01a147caa308408a32554233c5944181d143732173876e28bbf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=gta+minigun+cheat PDF link annotation
    • https://istruttorecinofilo.it/userfiles/file/zovijigexesotivanuze.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lisiluwutozeli.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/31675872500.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/92794845902.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16138e241124b0---wotafub.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/2369838772.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/bisokup.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofowekitumikozu.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/risipudajen.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/munaguzifuwosovek.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/71435576490.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/3652023955.pdfIn PDF document text
    • http://st03.it/userfiles/files/68949735872.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/73505861068.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/50459097228.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/fuzumadawanele.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132670fe63fd---lipejifapolu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/dituv.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/67584102021.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/54002449744.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/61476412338.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1e952d86cc2111e30a7d900d5c3384ea/bidotesafamiviwufo.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_off00012ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 18464 bytes
SHA-256: 6d4994ac0dac59b14d634ac4778b553cba304697c1c632f66f2630becf1a5c47
font_01_sfnt_off00015e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6B 10380 bytes
SHA-256: f399adfb17ea6189a6ecd5c59f536398aa3296714d1b83f20c31fa10f50f94b1
font_02_sfnt_off000175b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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