Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32de234969a0c6c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 20:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 689540818f4e9142102a14796dabb0c4 SHA-1: 9b3ea747174f5d41de799662f98ba6d31cadf2c7 SHA-256: f32de234969a0c6c455a2366399ca9a8155dd353aad8316c3bda52b5ae75596c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=the+owl+house+episodes+online PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394de736f42---beniwesaxise.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/72182551148.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xagetetobodekabakefavi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c77c40c50---90318709314.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/72653788299.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1384455047613a6053370a9.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/42616407739.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/5563340792.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/42287718672.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109111600541642.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xasatexunosezaset.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b7daf9c6---93656744457.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/19803293284.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/dosasevuzalin.pdfIn PDF document text
    • http://446888.top/userfiles/file/98753119025.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/35696736769.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/55186130166.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/88533126480.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910032706.pdfIn PDF document text
    • https://bunianco.com/other_files/File/4088921962.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/63567442757.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/xotel.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/ratawofaxumo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/12384695302.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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10280 bytes
SHA-256: 6572c88126887ae03f18a20342a550275a52b1280c420bd62dcbdcdf6b6cec8c
font_02_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 18180 bytes
SHA-256: f1e6b12f62ec612baee8a15d74a85fff33e5e46a8452c8756c9e40d5148e7983