Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0ff450c953211f…

MALICIOUS

PDF

101.3 KB Created: 2021-06-24 08:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 77061ca7bca2c47b5c1ca2a9d3a54202 SHA-1: 3aaab7ce8564dd4a5b7da64fe144a4b707d3abcc SHA-256: 5c0ff450c953211fe6469ad58edaddafd785c72f68b1d7641bb2053d1ad7ad63
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It presents a fake CAPTCHA or download button lure, designed to trick users into interacting with embedded links. The numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggest a link farm intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=pdf+xchange+viewer+serial+2.5 PDF link annotation
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/gadurudexagexadoputare.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/99335861889.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/53591480344.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e755b8be34d999480f2461d095df7301/17377799208.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/2189880734.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/pumevesexurovowijenuf.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/giwidemipawabitebuvoli.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df4162b83---82749032782.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b401be532dc---10784057353.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kexedidedo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/8302231597.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dul9016cb9dmjre3572qipkbp5/zipidotumaneparebunur.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6016419871---xeposofovataxutozawo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/db39ce1464ee21cd9fbeca4529685b7e/39957909146.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kewakajemuze.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/77bf965437c1b696dcae191ea34740c1/90380824463.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vuzagediwalu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/54426016158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 12528 bytes
SHA-256: b8904c9b15033905afba9a412301deb48b1ff0ad684dbd064a0cc3865da3fd31
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 5388 bytes
SHA-256: 3efaa4e4c67b580a30077d03e77bb9624d9652858eec91ccaeadda755ef46074
font_02_sfnt_off0001395d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395D 13304 bytes
SHA-256: 3901f1aaecd92d4033ea5c165e21513e74f1a365867e95a642fa503b9befe3bd
font_03_sfnt_off00016404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16404 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_04_sfnt_off00017932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17932 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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