Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea4d6f062addf15…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 02:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5ced3ee4560249ef7868c98cb454360 SHA-1: c40cd569e567cb84eef412356e0645a12d98eae0 SHA-256: aea4d6f062addf15e5f0e4cf632beeb8974d327583533a42d0fe413032fc6dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pensiuneavalentina.ro/app/webroot/file/78942600748.pdf In PDF document text
    • http://thephinhmienbac.com/upload/files/69516210468.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/28995660466.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c0f8287f9---84939324766.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984539a9ffe---bezomerejironozam.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a32c5ad20538ec5fc09410baa00b9fe6/10956328668.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/tulokiguranesinaxevifason.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/61017820785.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/dunofodikakikufet.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a15ac2ad9646bf9b304e81911efaebcf/58863410301.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/pevosuvi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/57494942976.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/jevosepivuwode.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/dipufowitezo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bad469ef---bewizizu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/916be5ca655e37d98c4ded04489c5485/pipizanuxudibiz.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/vesoradopofotazezo.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/nufonapidavel.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a879d2cba70---xasozilirisaxeve.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607467116a95b---68479715164.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/80275466569.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/70205023674.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wugokimopisu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725ba65b9c2---pokivosafuforovitog.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/02e47b6c92b5607a8f43207e5df0bba9/tivujatokomoxuxukaregubef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=abs+workout+pdf+filePDF 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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 10624 bytes
SHA-256: 28036b0dc4a52d5b5eea589c70fff5cad9a522f78610366dc02c7582d9795045
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 18652 bytes
SHA-256: c10f3bb1ab78e6f4f98816ea55f46803ec00c785e356f431fc9588bcb2daaa78
font_02_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1