Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5924f2edbd9d69…

MALICIOUS

PDF

72.0 KB Created: 2021-10-07 21:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6acfd63a3590cf65220569370d453eeb SHA-1: 41b7dcd10c41f2e3f2e4dd60e33b7c7fa1c3f0cd SHA-256: ca5924f2edbd9d698e71747649e5a747bc6ac87de6d79874ca3b2591b0517b69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://nomylo.ru/uplcv?utm_term=solubility+of+functional+groups PDF link annotation
    • https://dasyueshan.org/userfiles/file/penorab.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/91691570434.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/73684685605.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45010766296.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/wusalunutagelovamonuzide.pdfIn PDF document text
    • http://lg-palette.com/upload/files/5511217228.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/74542470405.pdfIn PDF document text
    • http://grotech.in/userfiles/file/19268599931.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/68861399775.pdfIn PDF document text
    • http://linza-market.ru/upload/files/69052315935.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ba698ed44cda0f4a85fbe574c1d0b597/61409435195.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/romesexuboxemura.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73947391705.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/guboranakusuvevopokub.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/bojidatibebabixixorifixe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3141257204433eea577abf501448c065/37673115177.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d5edae122951194eed542a956912cd53/14701822734.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1eb7b5728e3eb11446ec181434c9f1a2/10046607947.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/51106673841.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/gadabidetaz.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111711377772.pdfIn PDF document text
    • https://agros.net/uploads/file/59026469357.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/55832747305.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zatowigabetovefipudowuvil.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/47357064711.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/jebaredibesir.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16156780f30006---wizirabixupunomulaw.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_off0000bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10952 bytes
SHA-256: 1a6e1af8370c4fe820adc8e79ea483f106690f7f6afe5cb93a69c6b285fd31dc
font_02_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 15196 bytes
SHA-256: 6651fbc907d173277f2ed6ca8b04e35de97699169878e02d67953095cbb90b22