Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cfafd82f438eb6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 22:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70a912f5a29f12b4321c57991a9958aa SHA-1: 7b5716dee05c788ccbfc0a3947afd14559b309ca SHA-256: 48cfafd82f438eb6374b8e559f488d2548842111eb0ddfee5c1ecfe12abd2ff4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on domains associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dveropolis.ru/upload_picture/jerazifexuniza.pdf In PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/1092786207.pdfIn PDF document text
    • https://blogsma.com/files/33232571904.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/74583182895.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/109b50a844e0f7d5773a3666d924a202/13645832409.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/mokurukilirobirezimozesip.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tovev.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfef9c9b29---53205674220.pdfIn PDF document text
    • http://ausafe.net/images/art/files/1700648260.pdfIn PDF document text
    • https://hojoairport.com/images/file/vosizalomumenesisaron.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mekinilafafagabigoritozut.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/52072814057.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/89549399935.pdfIn PDF document text
    • https://sanidom.pl/img/file/11446583455.pdfIn PDF document text
    • http://dnepropress.net/files/file/87514881595.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/28218615948.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/fepilaxosezowidofaz.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/31544887305.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/87807740333.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/zamurudewevax.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99b20be49---jajovexowamapetezi.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fanipamavoraki.pdfIn PDF document text
    • https://nls.vn/upload/files/vasadupol.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/5720988620.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/vitilekol.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/49979887562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+open+mail+appPDF 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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 17436 bytes
SHA-256: 6f715163e8f668bcfd31af2761312676a670a1b9013666ad611d390d81dda45d
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10268 bytes
SHA-256: b9e69ad23ac72d9456a9c9a467b73aa843b5734a55cd6bd2df0fb5ddb00e8fcb
font_02_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1