Malicious PDF — malware analysis report

Static analysis result for SHA-256 70411fb4e25db171…

MALICIOUS

PDF

85.1 KB Created: 2021-07-23 17:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec3de5fd4215a701bfe74859bd3d4113 SHA-1: ad8c66029797f7999e8ba15b7153da002ff2ca4e SHA-256: 70411fb4e25db1718af0accabedde460e00c64a06b4a48a3fa53b91e9310a103
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b420d442abe---33642932592.pdf In PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/25453150024.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ef64f9ee---21807341288.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cef8d19fb94fe77daa4ded563f9d7765/juresifugiligarewu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rupoxirumiturugiwatinukax.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/nerunededigijakawim.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/17430778357.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wofidewotiwabizavuzaxudat.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609078e623fbc---30676101351.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wifurekesulul.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f9334109c43d2bdda7bc3fd8a41d5242/wozupo.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/80583713957.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefaf4c38a---96328586431.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/terofuxu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076029f98902---tejisimazaj.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/60469120375.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a318bc48411---6688461148.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/e71c591438a97bdaf3dcd31770b6ba44/xunavokodogakixezowumade.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/73436146102.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/eaf0992ddee46801b0ad19aab671064a/xulogubalosepux.pdfIn PDF document text
    • http://erex.hu/upload/file/lililawilividoludi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kuvewifibafodusixulo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac70b786e---lazogoxawefixasejepix.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1982bbcd34---tozuzaguxovilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+the+new+defender+any+goodPDF 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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 17276 bytes
SHA-256: 6c462fd04ca55c23bd91dff8049ed2375aa948454bce22fce2e95d9d065e4180
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 10648 bytes
SHA-256: 46a91ea4921fbe86c2b0baedda9f59b688adba4f692e529c1b7ab2f05ea9caa1

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