Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8add9c576627f0e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 15:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a85446eb56b9d300fb4fe1be392df630 SHA-1: fa970fd354f0cda285a29e7d02dc69710e6a2aaf SHA-256: f8add9c576627f0e874590b23697e0278195922c363259027695a5513a09ff33
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=taksonomi+bloom+pdf+malaysia PDF link annotation
    • http://beepost.vn/upload/userfiles/files/zexobirotexakob.pdfIn PDF document text
    • http://hibertek.com/image/files/20210831_013455.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/22006738273.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/878vm4m5e0jqbmpc8qco837l60/kilasazelojijamur.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29977244235.pdfIn PDF document text
    • http://nasikampung.info/contents//files/duloninoxe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f40e1731---teberiwosalujed.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bazamol.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/musarifixenekone.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b31b2e000---takijezom.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/96574679194.pdfIn PDF document text
    • http://benetalent.com/upload/files/12828913297.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d28f5f92aff1dea91253388a25ffadb1/kizerokop.pdfIn PDF document text
    • http://techbis.pl/files/file/ripigi.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/9878320376.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/72523817753.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d49dd30d97af2ace2061169bfac427cc/94529535216.pdfIn PDF document text
    • http://charivne.info/images/file/buxinunu.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fajen.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/10120242506.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/baxosiribepemedidajeza.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/75336874997.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1ff8a2cc1efd741e9eeb07880960656d/nuzoxurikoribo.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_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 16808 bytes
SHA-256: 34ce9d4fadb23d7270f50ba91ce4cf4e9726b2b004eb7cafeeb2774e14711113
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 10640 bytes
SHA-256: 39e943e736eb78f8df7d4fb69063adf8f5d2688455219d0c9667192ee33559de
font_02_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.