Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b69b35e7df4fc8…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 10:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d455e5334b4ac0f816f7059e7dd53705 SHA-1: ead2e15c3cad98cd1d2f612fb2efdc2a443d4e55 SHA-256: b6b69b35e7df4fc805ccef7a1794d3c5f641e29286f7448be85cf7ce8be3ff67
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on potentially compromised infrastructure points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=puge+download+apps PDF link annotation
    • http://erainbowrealty.com/userfiles/file/gudotomiratipug.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zusuwewuxojawij.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/fekuniwol.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8098f5990de02fc856ab24378e80709e/vetirimogenozaver.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/muwewe.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/48578883608.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96975910156.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/e2dieq0lvbq1f8efa4sk9p6beq/13664354008.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/52056342368.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/79196870579.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/repeju.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/fenuz.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/dapagovelisilibewivipizu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/42651406546.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614253d2f2a91---26163303318.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/90505849418.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/begekerugogimidoseni.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091626373277.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901140945_0rxgom.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8f28c12e---5498430509.pdfIn PDF document text
    • https://blokhol.com/upload/files/3149706123.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/99429392110.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/88995483632.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b7a9ed61---gupijesu.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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 14444 bytes
SHA-256: 4fa1e57bd320f248a4bb4c314bc2680a5258a7f1a0692d95ad4e26a2f4267e6c
font_01_sfnt_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 10464 bytes
SHA-256: 4a76a123d8c615c37556d7437ce941751a176a99cd96dbc1ed304d81bb6670cd
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1