Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff014af2ede05ccc…

MALICIOUS

PDF

71.0 KB Created: 2021-09-15 16:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13bc3afbfdd76886db3eb039511fd568 SHA-1: 65206461f67e580af5534171b7f19eec4c0062c9 SHA-256: ff014af2ede05ccc28a2acd5639a651d4e2064b385fa254a60fb99c50b322cdb
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users, potentially to phishing sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://0a3exp.com/upfiles/editor/files/27915283983.pdf In PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/4029455933.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tevonanebup.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2cb692bc3fab46240ab1c8d20391ef9a/33289975932.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vunedetilivofatokopiweda.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/bekonulemubaduriwasesaf.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93a9df613913752436e3d71862a2c045/22537754818.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rubejul.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xawagosak.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/67615701380.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/26600625509.pdfIn PDF document text
    • https://tessuno.com/upload/files/6130a2dd8e53a.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/78016191843.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/21591394558.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/gixilakukugefezetotijiwad.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xefori.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/94865928452.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/63617445640.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907032939.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/76734679398.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98f2c61a0---vapiwaxade.pdfIn PDF document text
    • http://bushurov.ru/images/files/fegakibixule.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/wofanad.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/70715288152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+cell+card+games+ioPDF 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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 16220 bytes
SHA-256: 3f0f43d657315cb5474624175e1f4e1d8797eb7d90634c4b40d3dba1bcc68c02
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 10488 bytes
SHA-256: d599758aa89823bc6e2745302fe5058ab4a913a0aa30ab8c99eaee74bf84b72f