Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7329481034207b…

MALICIOUS

PDF

84.0 KB Created: 2021-05-06 18:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43a58f68a6ac7b930eb1b96ab258f000 SHA-1: 9cca32984a03cfaaf269f961a05a7e6a5097158c SHA-256: 8e7329481034207bc44c586b545ca5aca018c3e513af98c2a43b9a7d05b4297a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ks6arprvkklr2haabjns9b7f41/5241539160.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086668ae5eef---84424441440.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f52d4eed---75318940083.pdf
    • https://artbynela.com/uploads/file/vukimefavefogutipopega.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/28733e53795202910b6dfab43a04fdc2/pesevanisubiguvoje.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b285c33ab1---tapemosudamewab.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282aa7b86b---9864567128.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1go84opfv81q1fsbaask0u9ajj/55907350535.pdf
    • https://ludifrance.fr/userfiles/file/50203177104.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7c15f7ccfc330746a4740a7d196d1a75/33334755681.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e5d8efd2---70991607898.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6895075c---goxumawugujexal.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fru4u56k86hujh59c8dangssp7/gasuxuxukimuxikovonotubuk.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607183f2cd1f3---93966235683.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc4d85bf8---27236717910.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c45cfd74a9fc944e56a7e0d32969db00/96814651018.pdf
    • https://advance-pack.com/editor_upload/file/92571928016.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e129ca033f4287129677be729e2422bf/kogujaziruvuvexojivi.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3cb9bd3b67b98773a59c5b41b0105737/30070555841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wondershare+mobilego+apk+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bc.bin
5af2e061b790d383ab8e19f40bd9578ce96aa727a6a3c1175ed683bd30d86d53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 5672 bytes
font_01_sfnt_off0000f9e3.bin
31490ea0fde7d4d90546978049219255b66f55a0f677f91275840706ebd1cbcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 21288 bytes
font_02_sfnt_off00012bab.bin
aa69740eacadd6e3897165688afcb59420473467c8e19eb759e89f210b539fa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16144 bytes