Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece19bc48bebdfbe…

MALICIOUS

PDF

99.3 KB Created: 2021-07-03 00:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a3bdae412aa9c379582bb6bdc3a300f SHA-1: dd1f937ae3e3d613320abd07f9637c1e7f6d1d61 SHA-256: ece19bc48bebdfbe277f52ffbcfeaf9558c3b30771399854d514bded4af72585
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to unknown PDFs hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23e81eb27---82384957607.pdf In PDF document text
    • https://faprosid.com/file/wikaremuruwa.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/63709780570.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210628012644.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/aiikmlvqoekchidguhm3as80sl/61205342526.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kisejumukiluzol.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/varop.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1390429427.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f19e41a75a2b3b67c96dd83b2df8a595/73313298086.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27449849079.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/82807573236.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940156f3dee---53573223085.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/827a88968bff6d30d2c72584d838963b/70246953927.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7400321ca---damurovilesesesova.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/jowimaxitu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d189cf9af57---kulubakosafakim.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0323715c---68277813088.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcba7aed6---56111953131.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/56023797402.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ec61f710ed45911e8c05437ed409493b/15309075091.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0c2b3b91f1b3c45c69f904233a86aa25/buviwuwogekexexobite.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/goxolonevenifato.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160866983501fb---40908863892.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/felositotuz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8fba09c9---55657599079.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/iorto5f3iialoantncjdolp1e5/xudadaxuzunidesijolixupid.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/76621027328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ark+how+to+tame+gallimimusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 18956 bytes
SHA-256: 6676196b69570dfe2cd41b5ae5bd2b4b8f8ff726d9fdac32e7d44a899f6bf394
font_01_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 16328 bytes
SHA-256: 9b8da9a649292ab5ede5fae631f21cb11492558fc929d6ae2bcb2ae37734b1f2
font_02_sfnt_off00014e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9F 10708 bytes
SHA-256: 70902e4e5dfed91939a88d8778a7f563bb73fc889288da4239136dd0761c43d9
font_03_sfnt_off00016756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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