Malicious PDF — malware analysis report

Static analysis result for SHA-256 928b217ee1e58e81…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 16:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 334fe96f27e857f1a443366da19566af SHA-1: 162cd369fd6e33d1fe6444c7f6c3919e5408b246 SHA-256: 928b217ee1e58e81b810f0892193836347b7d028e29d35a25dd31f2f80e7e163
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://studiotecnicobergamaschi.it/userfiles/files/20493513897.pdf In PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/relaruziwaxivuwupigiwos.pdfIn PDF document text
    • http://schokobrunnen.com/idata/21586258301.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/21665593180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab3e41146---dojagunezepul.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/kesajuvivudajugedamur.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/82445425524.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480967d6652---nipebowexefonemuviwovilu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/japefosulivujeped.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/98655674813.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/tegapopobitugosuni.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/88160481678.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/gefibuxexu.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/xulaxuwifamere.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/wufejufake.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/90295718059.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/topesinaxabexik.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341656ae1bb---28534508140.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/36504276067.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/24288794946.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/bozapiwivinapinirujobafiz.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gowitufefuxatuborod.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/motenedix.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/no292ei80miidk2do7qjqo8m31/xuvewiberakizoju.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/juzesijesejilatejetasune.pdfIn PDF document text
    • http://msiutilities.biz/documents/85834732610.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/51250727665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+1+8+ballPDF 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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 10224 bytes
SHA-256: f8666b032bff56466cebffaeea200712c619a82439bb8de58ef5942486b00c90
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 17060 bytes
SHA-256: 84561777f6b4094f96dd49831f62b47654253ea7c511469e762442ffd7f76785