Malicious PDF — malware analysis report

Static analysis result for SHA-256 8691d4ea4222a65b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 03:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 858deff6531b6c3a30315761c2f6681c SHA-1: b3af244d87f618aaad9c5447421e749fa1eef11e SHA-256: 8691d4ea4222a65b65a91f8c3ec3d31bf405f78a821c2077e202e7fb4ffa1326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential exploitation of PDF vulnerabilities or the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=probability+class+8+worksheet+pdf PDF link annotation
    • https://buffinvestment.com/upload/ckfinder/files/lugubeforupidipujexexet.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/u8477imt8ge9ekt0f0o6crbka2/76195259999.pdfIn PDF document text
    • http://full814.com/upload/files/lebovuwarolekarikoga.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/746383423.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/jaxepanogezenimatotow.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613014413e15f---malor.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8bcaf520cb88c7b16d6006c4bdad3018/wumusewelababufipo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///18664580859.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/delotonozisowagogomikirak.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/tebazexalunexitozuba.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/52104397829.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/63300077998.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137375f31c4f---16714854325.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q2smjiqfelgdt3u2219o5o7prb/jijudide.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353136e92b7---78003457949.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161474d25e0842---32883225248.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/81581186373.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/10680801814.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210910065849715070fgoxgodbly9k.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/vimasisufugoxu.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nefafatifori.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/movodirosuxaz.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/vesusajelelepevuja.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/47080665292.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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 18272 bytes
SHA-256: 8cde431b9778592ae10c2a8af0f5875f1fba6d0b27d332bfbf3b41e42c9b3e38
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 11252 bytes
SHA-256: d7b7012350672026449f043018404bb0809cf964b60fc89951845c1a060b8545

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