Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd40930505c6e3dc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 21:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a25e20de03502044ff65d2a018052153 SHA-1: 2e9b4936d2683dda9fddd8fcde3857050f3d3c14 SHA-256: fd40930505c6e3dc24174b937723a129e2ea2e6f0a0e5e8fcb953fce9efff99a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ppntassone.it/dati/upload/file/58470803418.pdf In PDF document text
    • http://champagne-marc-chauvet.com/images/files/wavekitenanagibudifoxi.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/wijazibiwi.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/36582151482.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/98060197130.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/lomaz.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/77176470175.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/65597587506.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45541c743---witomezur.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gugigegovutafezovi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kq43gksaavffcbg0tj8rkhd104/16254444407.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/jilaxuxelezeralo.pdfIn PDF document text
    • http://tochuchoinghi.org/files/79624823171.pdfIn PDF document text
    • https://luminex.pl/upload/file/21319261683.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/36178606075.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0c9af64c86f9f79e087a16f3bf903ec0/nalobuguseposugajezamadi.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/47119807032.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/jupajaxulutivabotexano.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137428d9da2f---zupomisixiwanubivawerepam.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/koradapigij.pdfIn PDF document text
    • https://losungversorger.com/product/file/lixetur.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jozanijonetonigezud.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/78775078141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+vpn+on+my+android+phonePDF 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 16108 bytes
SHA-256: 04cf00400970d4c93f279adcefd1f9f8a845f23c0876157565f1543063ecdc32
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 10784 bytes
SHA-256: c195560f0a61bf90563d5d977274c5440d73e117ca028161bf962d30b1828a34

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