Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ace4214ea503006…

MALICIOUS

PDF

89.3 KB Created: 2021-08-22 04:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6b0995006dc11bfc4ff3b97c83850ca SHA-1: 08840bd3f752c3cd24f9aa5c7bdb69530e2b69ee SHA-256: 8ace4214ea50300605c38f2d61152c70c2f00df6d374bb227a107cf29b441596
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised CMS upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of multiple distinct hosts and a high number of links per host further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/900204ab06fba8a39035c992801cbda2/vamazekotegub.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a304d758---kijigukuxixokimatabegi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001c1d887a---69603915769.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/befusid.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1fbf13a074824629bfc4fc52db6a6134/72082339318.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/gawegupinozerofazididej.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b13f68bc9---20140992788.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c264ff06d5---85615212023.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ncoca7u6k5gke254k6vvnff8kb/96059391350.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0259f3bb89---lojazuveketelebodawajeluk.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/62842661232.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/82730290323.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/8046078578.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/1449720882.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1a88e8ea90110e642618ca175bc0fd34/bikisepibopoped.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b56f82407ad10a2dd3b51c8ba7ad7311/mezajikajaxozodatebogir.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/bibawuvitikopiritila.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/73412071531.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/23359054785.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae879b3ef5d---ragimiwo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1o4kmr3qp93netg8f03taekr7k/42120672388.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/84c0ed29efe67ab2d630151a33273e10/mafonogufuxud.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5k13659dkacljdhvj0ept9rch5/55380139485.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60240326964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=names+for+genasiPDF 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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10388 bytes
SHA-256: 4b396ce752d2f9f050c94ecfe29cfe649a75bd176ee7d5858076f42ca2506de0
font_01_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 17056 bytes
SHA-256: 48b2fe34647401bb3d60a03b735a9516f79bcefe6408232f02aadd19a0fe7f9b

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