Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a5637853d3e25a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 08:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b23c57e2c3ec1c9f50b869f655573404 SHA-1: 9f6281f68a8ad0c36d0a3ca010c74a96617b1195 SHA-256: 84a5637853d3e25a60a74d2dfe541d23a59a76ce074a35ae8f58776c82056bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wastran.ru/uplcv?utm_term=after+we+collided+hd+full+movie PDF link annotation
    • http://santamariamikado.com/uploads/files/89422909397.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/81809822107.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd463552---sipafixezubugemo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/kujexafawofifaweduranisoj.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/50572111857.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/kasiv.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/83638664452.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/funutizut.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16131200e87b7a---30291839433.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/sekozujazituwirokato.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/jamopevivebikivudasix.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/35177737718.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86019846665.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161356b77cf9f7---kevofarixe.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/durat.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/63908502314.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130cef88af2e---29744395820.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484d5a12abc---nisutetetebifejo.pdfIn PDF document text
    • https://makenie.com/upload/files/latedozoxoziwivig.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/jegibapa.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/98873394208.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/38802050982.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/45045229472.pdfIn PDF document text
    • https://mklaassen.nl/images/file/zolip.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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 18552 bytes
SHA-256: 214433eb28b57922df4c41d79f90e63927835043d7d2b241432d6bb36bd84b16
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10540 bytes
SHA-256: a541c84043d912ecd8b9e47d78e6d83174f63605331011649613499f8d715661

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