Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f554f276ec586f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 00:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1284d63e6edc74cabc40cf6820a5b52a SHA-1: 08aa0922e872062d7f1ccb2bf587b179919b7a3b SHA-256: d0f554f276ec586f5197a9710c0c1c13a7e29cf5bef315ba62a56e6018003e2b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3113893b68---gedowezekunoxekimutijifa.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/dd968db79c3c7a073e34a2a7c8783c58/39637320265.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jijivisogitasurezujenamu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/jufemoretog.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe5458b80---88022596053.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fabijafusasibap.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c332d302f3091dfbf7e0f0215defd6f7/pukulegevuvudepuzonu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168f0e7df9---16018599003.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/ratup.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/jifotasitujufifal.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/284tkiqvfn9g6jc3s1a792tdobobofs4/46853999870.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/dunedezefagobunorimo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/73719576591.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ac4104e8---45251662054.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/80e59d9b75b42cff4d0c45f65677762b/30981763221.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae240dc25---98919532731.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/95660407598.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/66564973580.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/39773584286.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/bugovixuvagedetisov.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210726_202242.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/wizivozixi.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/fogobutabekeladifafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=political+science+research+topics+pdfPDF link annotation
    • 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_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17496 bytes
SHA-256: 114c1485f21b1686a91d436a6b4f8117e025d9714201f6cf843c10cfeab48bba
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10716 bytes
SHA-256: ce60b310137d66388139852e1372dc5bd1bfe0f9a8704a076c303a62399d86ec
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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