Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba00c3b7a92f8d5e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 15:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4a5d64444bb2cf77b79cd19a0710026 SHA-1: f82f837fd7e8b9dcb10914dd2e0d54ae17b78474 SHA-256: ba00c3b7a92f8d5ed93c3479019b047cb1fd09c60bc5d6b16270896e36ba7135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm patterns, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to compromised sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to exploit users via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=jurnal+akhlak+tercela+pdf PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50cd93608---18805492073.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86364293811.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/69664898298.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/80110436606.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3af06019---filizop.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/pevariziwagefuwiju.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tpfkjbbu3hpuhe3vhs5f9vlbj2/79749505419.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/beluwesaminomi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e64e96f100f---rudawax.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/45787192862.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jl76kb8odtthnnmdisqaaf0ne5/79615803229.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/nezazajituz.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/23597435674.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/laragufulisekirij.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/bunokirunixinawogi.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_201947_123.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238f1ee814---jewujagawuvi.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/53511685416.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/92672344398.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8731c58024271341a990e3cc35bc582a/jujalolasufera.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081be0f1ea39---xizogowifodoritago.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/siwivobadezalimujebenika.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/vie4p7esacp063vocno4ms69b8/kibujafogizegupedat.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/44988219957.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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 18100 bytes
SHA-256: 3f8dc6fc425d819fb066edbf9fc0d26241a36e89db3a350b0b72aac20b2f3acb
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10520 bytes
SHA-256: da06113629311edc957627112a0ab208aba089a1c4c3c8b815233e5296b807d7
font_02_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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