Malicious PDF — malware analysis report

Static analysis result for SHA-256 e867706683e80ac0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 04:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: af273edeba5bb9a6b5b5ee3dc4c24a21 SHA-1: 4d23d62dee48e65aaceab0ac7020887f304be6c8 SHA-256: e867706683e80ac0ee669c5d1c59bfcfa9aa967013fa60514a7cafa70cf5b6e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akemi.ro/hirek/file/98814889371.pdf In PDF document text
    • http://msiutilities.biz/documents/dotade.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/38ncnetpvq3d6l70rsv71vkmoc/45050340221.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21327118079.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/23156378297.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/29419957627.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/8575091978.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nunivotifitowafa.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/ribubegamowixamibuvogapuk.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/nusamibenisewawedatukod.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f729eb9d92---folel.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecac758b3e---63382187792.pdfIn PDF document text
    • https://slide-bearing.com/d/files/lumedexanajelezatidewak.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/tapejuvip.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/22004040108.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/paruri.pdfIn PDF document text
    • http://hbaoge.com/upload/files/tijunufiteriwefawi.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/57080844807.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/23653374925.pdfIn PDF document text
    • http://www.pilartangguh.com/file/gimeraxegojukamo.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/47620681495.pdfIn PDF document text
    • http://pedraferro.com/files/files/bifolig.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zesugolereraloj.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/40055923682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ptv+sports+live+pcPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/4720769706.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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 17140 bytes
SHA-256: 3b2d36d639633c02c7c845f0b6034a0deafe78938c2c2ec3b2097d60cf27fc12
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10168 bytes
SHA-256: f926033891f751db7608d0af04ee595fa686fdbe955b7149df599e1679eafcb5