Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e1da29f87d21b3…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 03:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2b4f425363dea81899462aec787bdd84 SHA-1: 49606934adf684f68386452862f4558f8f1dd353 SHA-256: a8e1da29f87d21b35cd80cb2eb52ffec0f3c16524dd834183e884e81bd166b90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm nature and high detection scores are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://pmapmc.com/userfiles/image/files/tozavid.pdf In PDF document text
    • http://esen.life/userfiles/file/48998454933.pdfIn PDF document text
    • http://cmtsport.com/pliki/11758516007.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88234871035.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/67931172502.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/95412495790.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109171150244730.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/80895702294.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ba1b89cf---88494017197.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c156a0883---sinejojobisibuk.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/pevukivovawabow.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/40808361651.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/86985302568.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/37864312500.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3375669f67245a6d0951693dbd92e21e/fetevikixisikafa.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161300ebecef1a---guvezufomakowezi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/bujosogug.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd40cad366efd9e4ddc9273fdf9e0051/13558755938.pdfIn PDF document text
    • http://esangsok.com/upfile/files/4671958716.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03c7dd17---legowogojofutut.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/49359982582.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozodabajevitibamuwetok.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/17484724146.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/xojopi.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/bizazeziginak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=soup+mate+pro+manual+pdfPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 17860 bytes
SHA-256: 90156ed94e4a7456cff528027c81932fc27baba5980e87bd65dfe4280cfd5ac0
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10572 bytes
SHA-256: afb01cbc5eb9a303964cd693be6875075fcb9e1917ec15c6c9873889e6b24c3e