Malicious PDF — malware analysis report

Static analysis result for SHA-256 08253d816a6b51f8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 16:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c90712872e999b97180786109adbd695 SHA-1: 3ff04accd8b4cf4d8fc7ab7fed9b601ebec97270 SHA-256: 08253d816a6b51f898fbb320a581bb9b4cb2252b5b5d335d59c64455433d3fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mimpiindah1.com/contents/files/52574126638.pdf In PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zarerologut.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904205951602342.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368cbd4ec95---ritomesokidavoteluw.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/fagagefegugemoz.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/talovogavoruvepemibumox.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613866e18e036---82917709417.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/tabamebawupomorodotopat.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/66048899518.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/41284371946.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/31347141693.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c13eca74---fegixakolizawibojif.pdfIn PDF document text
    • http://carszana.com/image/upload/File/1294566364.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/54949614266.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951050345877.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/loxuba.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gawitorisajana.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/95290185729.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149ce55397---31433946303.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/58488215999.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/fekusanefoguburaramowa.pdfIn PDF document text
    • http://hoachattn.com/image/files/vogadurududukaduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=head+ball+2+hack+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 18124 bytes
SHA-256: 1c9b1d6ed7e49409677250ec5cfae16f38845b24b07d036906512a2e6bfcaac1
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10560 bytes
SHA-256: 3f4c5d5f5bc4f889253ca56f286a3dd90b94b62d5fed4632b348c0e034caf2fb

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