Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf583f20d7bdf8ca…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 09:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40dbf84f2c0420cac1c210ce16f5d952 SHA-1: 9ac44751cd749f8ff734d6b432f2f7ef57106af2 SHA-256: bf583f20d7bdf8ca4778fc51da5500f147a6b5549ecd67b60514a646525f1aab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://7sate.com/filespath/files/20210909070651.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jadefu.pdf
    • http://argyleliquidations.com/userfiles/files/72257750733.pdf
    • https://calienglish.com/ckfinder/images_store/files/78392713492.pdf
    • http://apcmagon.com/userfiles/41009939794.pdf
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912050837551441.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/gugejedimivelalujogonew.pdf
    • http://riverside-plaza.com/upload/userfile/files/45524643023.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8lktkd2d6fv4f1q76lmrp7nn5o/bofaritepoxojaravezuw.pdf
    • http://myesen.life/userfiles/file/14380090969.pdf
    • https://praktijk-fix.nl/userfiles/image/file/buxetug.pdf
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907231520535241.pdf
    • http://songpinhao.com/userfiles/files/29704246526.pdf
    • http://bushurov.ru/images/files/gusatajudapelukidim.pdf
    • https://thebottombillion.org/business_school/uploads/file/3839425314.pdf
    • https://alamansyria.com/userfiles/file/75914956130.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908010825.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357bc5337e2---89847219260.pdf
    • https://vespaclubcagliari.com/userfiles/file/folosewugowumun.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65091123692.pdf
    • http://el-master.ru/userfiles/file/sexokamifitotedajer.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a686003c18---dunefenogubovexux.pdf
    • https://alate.org/admin/fckeditor/editorfile/jutitaxaretebaze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+free+gems+in+clash+royale+without+human+verification
    • 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://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_off0000b61c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 16792 bytes
font_01_sfnt_off0000ce2e.bin
16c7fd36813030fe8a3a6491f6e4070ea29102d13746997236209e7cadd0efec
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 14800 bytes
font_02_sfnt_off0000f380.bin
2123afc7903339f97999d6a73a53b11c7fe338fae0e363b427c2b42f48d1607e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 11140 bytes