Malicious PDF — malware analysis report

Static analysis result for SHA-256 798e790b38c657d2…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 16:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 25ef3d786c1853784557fce0a65e47e0 SHA-1: 4dd4612f2f68346bb0f9302d39c57c5b0242549d SHA-256: 798e790b38c657d260c667967d622355bc00b1bed60ebaed655fc9f1c4c956ec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting. The links are presented as a way to reduce PDF file size, but they lead to other PDF files, likely serving as a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=how+to+reduce+a+file+size+in+pdf PDF link annotation
    • http://pitin-akutsu.com/js/upload/files/86576428961.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c047da9824---65676765131.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f4962b97---bajosobu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073035de738c---14727883321.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c44f2ae8---raperaveje.pdfIn PDF document text
    • http://fructusartis.com/i/File/27947850141.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/57246742315.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210626092946.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r469fles9m3rvaen8cikm84p63/38122501859.pdfIn PDF document text
    • http://ridendo.cz/files/file/suxavonob.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/6616089921.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nreho7hm2n42go3l8bb5mo1qa0/88087724109.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/gutobowanipaz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/25a0c01e08611c1a4c18eaa378d9dd44/fakitiwezodudobipeva.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2384c6af---jegipemuzuravikubu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a7a49beb72001e1d5ea375020fce23c8/zadal.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebudojomixef.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/631210e14f36d7651e88ae880cc6dbed/repoxikururisaxutademit.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1476206c353940644ac8d0043083f44b/45694199285.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/92064357210.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/55057821293.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/vodokot.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/5295485007.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ee05c25d9b832fae1e02d272cf37f624/20445182123.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/42142901513.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ieus88g23nfurv13r1a619om0m/mojim.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8224e32dec---bodevezarunokug.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_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 17008 bytes
SHA-256: 55750195115db12c7d176a9659d647d4c355382aefc400e50c1f7a945fc8a433
font_01_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 10848 bytes
SHA-256: 232df4c44107a76bb289d28d64a4808c6d7dcb4ddbae38e874e0cbea713776b7

Open this report in the interactive analyzer, or submit your own file for analysis.