Malicious PDF — malware analysis report

Static analysis result for SHA-256 1435e028cc62dede…

MALICIOUS

PDF

138.5 KB Created: 2021-06-12 15:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 02f48cb614cbbc6d93c53fd9d9edd2d0 SHA-1: cfe1e404487f44fad9e8c52261fac1bc6c3ddf5b SHA-256: 1435e028cc62dede7cb68b2761463b40fd371770a15370fb50b76b93071dfda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://krisoc.ru/uplcv?utm_term=hum+saath+saath+hain+full+movie+hd PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f403ce6da9---rizinunowevosobasegor.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba76c2a0b7---ritelirudusan.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0avct119t3d7afbclu0jt9eqj6/darufozizerenefiwezi.pdfIn PDF document text
    • https://medtek.vn/storage/file/91595551781.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caefbd7441---kilod.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/50229275589.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1f6c8780---67174746358.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/dixowiwuseguxujatolamizof.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/312535bc5e3b7fd737fef71dc0120645/90851701485.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/c3nv4u4sgern61jkm0s4g3kgkn/53585414199.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e825556a---miwuwupaleguwa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/10425417546.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/vudefokozopetixepo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094874899a67---zarig.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a345d6cab32---85506755766.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ubf7fo0rpb9h9khk8mnqug5v63/venabulikiwanodefasetub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001eee1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1EEE1 17284 bytes
SHA-256: ac5f7c15ed6fb80c701d94ce6a3916660c2b94379c45d78485c60afc2d3185ab
font_00_sfnt_off0001636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636E 6832 bytes
SHA-256: c94f7bf2ddcbc1bc3fd692f064b1ae9aebb787ad29d603738cab9d3ac92d0e0c
font_01_sfnt_off0001748d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1748D 13052 bytes
SHA-256: 7e6ca5549f59dbae33fc86a756f0b24d7895ff43ecc541346e2697b524033a32
font_02_sfnt_off00019fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FAB 5072 bytes
SHA-256: 91364b9d4b12f31e8544bef3e59cb3be004e636a6cb867a1c61013387cf4ff68
font_03_sfnt_off0001b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C5 2852 bytes
SHA-256: 72fc534e25613568a6b782ad45c8f123d3d92b2b6a721800d5e23ba961eb41d7
font_04_sfnt_off0001bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCE9 15864 bytes
SHA-256: 11cd7c66ea807770929a116e36147c80a34393089fbbee31962733e2aa058f6a
font_06_sfnt_off0002084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2084E 4424 bytes
SHA-256: 6cb31c86596ac80f8bd00c0d17ebdac1f5cfa66a897becbe13614865c2ac0273

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