Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c3c5e6639c1ab4…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 01:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f319c243a0228344b6187b7370f3a5b6 SHA-1: 533978bf80c4f0f2d6a250f802ed4bfc2aac60fe SHA-256: 35c3c5e6639c1ab4684a2ed1f7c3e045e41159be07008c5a6f1b2e307835479f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to malicious or phishing sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://allytemp.ru/uplcv?utm_term=discounted+cash+flow+valuation+excel+template PDF link annotation
    • https://chachachat.info/js/ckfinder/userfiles/files/3271842225.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/torubikekikufato.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/01e05934053415b6147465d19e144a70/47485969516.pdfIn PDF document text
    • http://abwessex.com/uploads/files/81148690423.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7318e0f8d---49898306999.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceaf475796---xogefapafepisevif.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085562da43f4---bogulemodikuwebek.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaa0e834db---xufef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c974a865---17690066071.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/57snqjkkev13jciv1n1r0531up/wazedo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ec696278---kiwofebunupipokamal.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/joruvufukukonagawafalazo.pdfIn PDF document text
    • http://soupworld.de/upload/file/14272351022.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/tugipabalinutidifusudonun.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/id5n4ua65vkl83q6ncnje42m0h/nanudarojiwis.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/diwitazojamup.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/dcdd95cd02988b0e7c6c0a48d657c8f9/kalivabunexetaj.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/563e2c83b6089f8e0d7e05404c72fc0a/34778973245.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4601b4db333ef77bfee24928101fdf22/3071129327.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/89335549936.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/tupukeduxororuz.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f66870361c9aceb8bf42a4c9c7790491/supaporogozafu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce994ae735---juxasedo.pdfIn PDF document text
    • https://memoservicesrl.it/file/jatuxed.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/10746989325.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 18232 bytes
SHA-256: 2d683239f09634e2445b0148990a7bff868950886d89eead6d792b31b7bb0e3c
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 11140 bytes
SHA-256: ffd7d041cd48589a9b130adb46e228b8a9c1186d541dc7ca9e117360873d0bab
font_02_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1