Malicious PDF — malware analysis report

Static analysis result for SHA-256 852d952237c29926…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 00fc6bcf431be14a1dea267c13727410 SHA-1: 6b52cf850af6ea8c78a111801217378dd8ae211c SHA-256: 852d952237c2992629f2772e89eb93eda431364d736feedf30974b848aba5543
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The PDF structure itself is indicative of a malicious document, with heuristics flagging it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac0e41d61---89454361683.pdf In PDF document text
    • http://saptpadi.com/files/file/95896376126.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f8389050216f1654e5c672bf0a82eec4/vugabofexikud.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8b8f5b0ee00d0c0ed5d0fed58cbca786/62480652936.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39b1c7fc4---wotivenagelajexopazuv.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/46e9da4eba42071419c0fccbe4c26796/niwisutogisexusuja.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b593dd7f29bcef170fd200d9eb67db77/putugevigidemapuf.pdfIn PDF document text
    • https://visualarchive.bg/files/jatovojoxedufulomajuvi.pdfIn PDF document text
    • http://billsky.ee/files/file/40910746619.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5gjn6o04v79rq8csr6liivt3de/38878426764.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/burixutizi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kupazegoraxilavosatave.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/moxunuwurirusori.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ulct9f67fj4jbio33m68rviojk/ruwufakobol.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833a9eb5661---mibevarubitexolafada.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/52118953239.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/41500089853.pdfIn PDF document text
    • http://learningkey.org/userfiles/67343948995.pdfIn PDF document text
    • http://dnepropress.net/files/file/61825255060.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/7183534838.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdc6e7754---50986878351.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/46005574683.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ks973hoj6kv8h0jdg8pn9vo5uk/jovetulofasebizip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/okhima9klmr488u7ht504ovjm1/fivig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=healthy+back+of+tongue+picturesPDF 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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 11196 bytes
SHA-256: a08d49b9064b690a4979fee3d59dbf7f768e0c6e11f0e4a18d7d23c4abcef7ce
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 17016 bytes
SHA-256: f5c43917fb2d62619f450beb5e5d6ebec1f9c8362b4264a1e4085b68f5df91e6
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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