Malicious PDF — malware analysis report

Static analysis result for SHA-256 c698267a7ad1f69a…

MALICIOUS

PDF

148.5 KB Created: 2021-07-23 00:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7373681d6b066645cb05a97824b28334 SHA-1: 09b54538d63e8daa5133810f08606c486414849b SHA-256: c698267a7ad1f69a4cd08b2c05af88a2435202dd4641acfeaf5c9e96443d4d2a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings confirm the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://centrons.com/uploaded/file/143324066260d4c4875b01e.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcea9b125---batexalozumokogu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/tawibudejubo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/25461909576.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5b193d39ad521d67ff4d509818dbeefd/segurogarojurepewolom.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2127dd9e43f12d59b3c78a2020ff9b2e/kiwutoridapizesawoj.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/60544954736.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a8395fc941066f28401ea51cf3b4b64e/dejab.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/318121608c4429f70e9c47e1b2527ccd/51053641640.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6400e66c7---sivowobixozov.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gujewowikepokibib.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e3bf59c3b4508d008704513fcf553cbf/veloxaronagemigunex.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/xogamiwiruxewezu.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/60565034597.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609431641b195---97204110627.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/pizod.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/43476877838.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/8768486156.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xefugesipabizolefajen.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da24932f2d8---gesugipiloduwetejexiluxo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da338a802d---167798514.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/febusuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=histochemistry+of+oral+tissuesPDF 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_off0001e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0F2 10700 bytes
SHA-256: f13a8a2261f8fd0e0f6e7703febb22eae0031e1ca9b9c3816064ac528636ac65
font_01_sfnt_off0001f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2119D 19456 bytes
SHA-256: 667c8c127fcba7696f90ab0fb8da6751006ca9c0f1b0eb2871906f8d74e2ac91

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