Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca046d800064468…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 07:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57d8f6af5706c11608b39b87cc5a5e0 SHA-1: ea00a2210682c30f8390439f307686111e5c3af1 SHA-256: cca046d80006446864e05bb361c9c9ffe1e4245e60f5f3c283aa2f5d5c3144c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these links suggests an attempt to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://b2bircruise.travflex.com/bot/ckfinder/uf/files/3804299660.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09eca52a0---dobedemiwuk.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/33345523762.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/livorivuke.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/54183873299.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/86429530949.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/sonerifa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/08e153b56ca89ab22f6e1a818b35999e/lazuterowekibajigixa.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/38963689205.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/sitibagejer.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/lukenoxekanok.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/43340874750.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/17835600661.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xeporum.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e2ro7l5megsm91oibilkk81l6d/ruwogeloz.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/97207976326.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/nonukozaxofowigamonozumag.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906084824.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/xilisixijavis.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/72854398028.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/56031758602.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/39723163254.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/wijukos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cortex+m7+linuxPDF 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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 19232 bytes
SHA-256: 04a669194c0e5541521424c1f3193c7438fd8b144e852082da584386fe5e1952
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10224 bytes
SHA-256: 40f1290d32486158bd57a80ff83122ce76a1b77effdd78015ccbc8bdf1b70834
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1