Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f22802ddb81073…

MALICIOUS

PDF

74.8 KB Created: 2021-07-13 10:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e7a18a117c42ae2638a327c30ae825d SHA-1: 60c17db38c870ba1f473ca09715be3cc60c8b85a SHA-256: 39f22802ddb81073bf28495e02ded37f0383e8c6c71e1011c76e1b9187b2b865
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/412c87097e581208adde5d1629264b5f/nifepizuxolijeborale.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/adcf590434d6e0a97dfdae9b3eb23460/nuvevavadajo.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/nuzozifopana.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-15/20210615180023581342.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2963c928a48d15c7967d9c262d7a72e7/napimaf.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/shsitmam7spitnkvahv9s6vl90/65872021558.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076750f53b79---49160105970.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/buwovo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a54937f62943e02d3c4baba590b8bcd1/22063916271.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/11f366047578afdd0893b776b43582bb/19787640627.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d621dfda43b8e25e7b3b4cd54cfb898d/81655445865.pdfIn PDF document text
    • https://cmoretv.com/userfiles/89945272123.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/32f8b4d5a1a0b039446a97f4a1a4d115/loxukutik.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e10c9f2c415---43309770578.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/6722835870.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/23443115530.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/44619208415.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7ccd5fccedc427a3dc440a5db2442c02/lugelemuneritu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/58d64d49221d813bd228b7266a605f8d/karegaxelupisexevav.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c58a46c626---jivexoluloxefumovura.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9umvieto2glhom9hejlbtka20b/11939209071.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/tafugaveroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=carbonated+soft+drinks+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/96552165418.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_off0000c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10708 bytes
SHA-256: b7da374954cf97deec1f4bb76c983b80ff94662f60e340ef48c49e5faf150771
font_02_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 17024 bytes
SHA-256: e55e3f2806a06cb71f24dbb7d41226dc69f3bd40588039e23c30b755ed44e01d

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