Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a9ccaeab3ee612…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 04:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75e78dbf3531a255e9cde187fd5f8278 SHA-1: 96c11b1b46572c5326b88f031387501b219a2bad SHA-256: 53a9ccaeab3ee612f9c3d8a318e7996bf082eadba921884ca4fb16b3efd18c22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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 http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/fumubomopomebele.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/09bb0dd4ead4d3eeb3b7a62c9eece6a0/wesadoruxepogodedefi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0d640104---zuvovi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/42d82acdb6dd18537b18f6c7c6a5af9d/65359934474.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/jediborokuxon.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/djjiqr059c0h26fonjd37v09iq/24814014998.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc10a863b6---66032965510.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///lidedeti.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9ef4c12e---melofalukabani.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/vebiz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3cddd5494---megusig.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf280927f1---nenifigumiju.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/gebibugofifade.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/66563590728.pdfIn PDF document text
    • http://abnicum.ru/files/file/kopemiteragemev.pdfIn PDF document text
    • https://mar3ol.com/Files/files/meripu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kalebudafidunetiti.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jovudazi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vibijadobamasawefomevona.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/v9qou76d68vd2rus1souo6rmvu/fenaposawiro.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wufidoradeve.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d30260f8---63323300093.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f497343ee58---merowobunubajevutux.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c1q8bta2qomfmp1q6lac1fjf0q/fepelagowi.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210629_C0AA85AAE9CFF979.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/14548616990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exploring+art+a+global+thematic+approach+4th+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16640 bytes
SHA-256: 879eaa6ff759dfa2363d570086903c0f973a89d5615b85f83f734ba4c5a78d4c
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 11200 bytes
SHA-256: 6e5df66510129cc7c6e8be287ed2e4eb951893c78a297feba2975bd06b2c2144
font_03_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0