Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a40f66d95bfedfe…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 15:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ae58fb43101d112757a2d654c15e6a2 SHA-1: aa6a3b95604962b04bf64de4e9d52276046a5715 SHA-256: 1a40f66d95bfedfee05c2c30d9ad8e014bd2ea5696352a75c8b85599e350fe4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=coolmuster+android+assistant+for+mac PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qibekdu9fokap82vqe4clfqcs5/8603651548.pdfIn PDF document text
    • https://bawauang.com/contents/files/resevis.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f92206e57e1a30840ebc7f5fccda38cc/70784676747.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/50036436711.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/26468323745.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902170234.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/2968322624.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/toxutabikawivu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/19260210137.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/pefukixexofu.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zawokupazonufafelugo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bdb5e722---45933263316.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/50312573124.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zapavokawina.pdfIn PDF document text
    • https://nomortiga.com/contents/files/84071880051.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/85554705960.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f316aabef1---2879803235.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/96142445730.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mazupamujogexitodilika.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/8f702253027540ff5fc76e39d53fa033/26718873506.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tilibizawegukogefufaned.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/28762222324.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/4942371177.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/85340428908.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f62486bfa---wixapikubutixepurap.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/66500941293.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 18700 bytes
SHA-256: 53ce2b7c256404c1009aa086df04359d22c8ef74e70ccce811f96f65b2dff4eb
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10768 bytes
SHA-256: 2d4262b7e15dc19fb561264e40f6267c44f61e56be0b1fecf083d29be92285f6

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