Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a7ef9f11fe2b34…

MALICIOUS

PDF

89.2 KB Created: 2021-07-08 04:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2298760900c3cf8d2c3d0ef100bfcff3 SHA-1: 62095c27dcf86984c5d6985473b34368223983b0 SHA-256: a1a7ef9f11fe2b344d473db1251fb190f387680640a91ca2ea0c92168ebca41e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary function appears to be acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=2+letter+words+starting+with+s PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a553e5edb24073524bb74a51b75dd78f/gozuk.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4ee0d730---velajamubox.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/14712095896.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/26566518188.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8d70653b---domaziwolivix.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a20902806---1997838868.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc9f8fdfd---3668555201.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da613d4cd---zudegomegepat.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/zusakutikisilalukurifab.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab088e30ba---maroro.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c2c02aec---zekivupizotelero.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac10108b2---79132218906.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d927ea9c---14777534063.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vop9eojknq150uecf97pjsfecb/jinoni.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfebaaec19---3948104598.pdfIn PDF document text
    • http://northcity.rs/slike/files/tenobepedidizi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e833cf7f5---xifuwixuzu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeb187085---puropugezaginad.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/7i5jmneg0p99bagd5s3dtiklf0/lojojukenub.pdfIn PDF document text
    • http://ausafe.net/images/art/files/63714399512.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/14749463886.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/dibewokaretov.pdfIn PDF document text
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160793d14ca96f---juvogoxogane.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/moxitukuvopajo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6d0242f2f9c3ac3c36dba5b3f1d84cb0/69303187334.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0cv799kcmsc7h57m6uc52mkbiq/guvekobites.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/ziwamumudixege.pdfIn PDF document text
    • 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_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 17868 bytes
SHA-256: af7ac71471d45ce86c4690643d54c1d2a63e1975bb10f8d78e1c283fe7bbc816
font_01_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 10636 bytes
SHA-256: de2be9132e5331a9f3b074108eb6eb3cb781017dee285df2c4e62c314959dfa3

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