Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c787b286b43245…

MALICIOUS

PDF

97.9 KB Created: 2021-08-20 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 348df42a5083c0a74e893ac1563cde14 SHA-1: 06e5bb3e16ee81b40c16c4051acd9f4e20e93e5e SHA-256: 03c787b286b43245c43fe770dbdbaf09fe5d332787f90fb3925c44fb358aa852
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e2c83912---gafinefazujovefixozo.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1d951a4f5befb2fa28a6a9d728a49614/42783357007.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/djh572jpteog9ih9gag2n98gt7/tobonuzupe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pugisedon.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/6539356358.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/tujonixerosapowipozezuj.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/453a52c55b9e1eef357ea140ee26e4cb/52015211004.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/pogafotubemelogike.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fawegaketolokamugami.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4499dd4c177afd73981c96314bc29d9e/3824812803.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/guvasekinem.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/j8rseejvg01gu0qiihto9bajp7/rigomufofojotaxapiri.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9d384c8911ada46d5f8b65de54c29cbb/jomatove.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/15103803372.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/91225985702.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d905e7978b---dotim.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115400a280f6---30675384923.pdfIn PDF document text
    • http://viorina-deko.com/images/file/54384860023.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3596728be---31652022555.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gauoucb48bmnakcltb0haki2po/xofoxoj.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/66586185329.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081711244173499.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5556cdfa---nobupoxowagoxunexe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160960705c3f01---96108521328.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4cdc28f7500445dc360d03092afff7fb/fobeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+size+trimmer+line+for+stihl+fs+56+rcPDF 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_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 17072 bytes
SHA-256: 2649a313dd959b38963b9bf894830b7003f88a318f88ce9b0a2a9f3dbeb86855
font_01_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 10956 bytes
SHA-256: e527562b31dc2851f1bd5d4f89215a72c52085f15cfabb894240c88ffc712ba4
font_02_sfnt_off0001600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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