Malicious PDF — malware analysis report

Static analysis result for SHA-256 da351109cf318b07…

MALICIOUS

PDF

83.5 KB Created: 2021-07-10 00:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11699e0f8f52b3d68258c8a4a91267f2 SHA-1: 42684fad42b273d944e12681b2addddf30523788 SHA-256: da351109cf318b07310cc73ac821b2568a0666fa8bfaf1ff7fb728f59af8bcf5
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8cfd27f8---xikokexoradot.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7887ab3290f198bcb0cc4c56a7587af5/parafidobiz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/71418311462.pdfIn PDF document text
    • http://dalaichau.com/files/76143482572.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/83738050234.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kewumusogivetiwu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6354814b---potowogefiwug.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/ruripofuloxakexofuwar.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/45370844899.pdfIn PDF document text
    • https://kimansion.com/uploads/file/sipopolarolerotedanov.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6010d2a26---tedafozivomelonas.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ohr3uvh7jjsi5osk1op4omb66/silojajupiredisudoxi.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/172fef3b2b540ecb08b67ac31a9bfc82/xekabi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eaece214e---43445813904.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca4a05510---40553140272.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/km3h7v3btcln2ajdrvat4tpep0/gutanowimu.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/benoxexatefegefijip.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609661726e7ea---kuvuzizupesowewerom.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/livewivesasawavaxexezano.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d2308dae9899da845a7c6cb5630978db/buzedepabaxotufida.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58956006726.pdfIn PDF document text
    • http://azizolace.cz/images/file/gafamafejerexubifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+upload+a+mod+in+happymodPDF 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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 10548 bytes
SHA-256: 27c726dd08f667547bed46378323724e3e17497eb14c67de724c3f2c8ab74e25
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 17300 bytes
SHA-256: 23af4479877fe6847e941d584040e5f6b05c258079e894cfa389babbab472a66

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