Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe967899682f045…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 01:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b3eeca1e530be929fb68a05d4f0af1a9 SHA-1: c6bf4d987beeef7dd3d9fb39e062b1ad4a767a0f SHA-256: afe967899682f04582e9554ceb3f589d188933213bb4c6bef2d626ae8cf995a0
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 compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm on disposable hosting, suggesting an attempt to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec434ae5cc---nofizokoxogumeka.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072adba29af9---86601641973.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b418775f8a5---lenewek.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zofesezajivozofikaza.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/81032334929.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/75846366392.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/bb1301056340fb38f3268f7ca561e951/40538525428.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d2da2ff5---wisupogonekanebiregavazo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e991e47ba4---12059251869.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/96441446033.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098972abae7a---1145787474.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/lewiko.pdfIn PDF document text
    • https://bursac.net/userfiles/file/5477057424.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/wudufiti.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c884c653650---nakejalakosegagidinonaviv.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbfc977f7---xaxesupevotiwifulalu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475ad00f07---78253985546.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/13a2dd34d7711982945ac705305cc993/96312082297.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a35432b---37338584067.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/12910323938.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gizuvaxamikawasamuseduz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bimanew.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/84599543564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dark+and+mysterious+namesPDF 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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 18212 bytes
SHA-256: 059314bbece68e403126261fad25c7c79f71925edc5c4566d178654faeeaeff0
font_01_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382B 10672 bytes
SHA-256: c5cf9b4bda8afd24fbad2e3ee7618ed58cd315d7f8dc7dd6c79539ba1fc0c2f4

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