Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae45b6363dfe6ad…

MALICIOUS

PDF

81.0 KB Created: 2021-06-26 07:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fdcf076f71680440ba9412a83a302772 SHA-1: 80d0d6099cfd591745f1cfa1ee271512d60ea5a9 SHA-256: 0ae45b6363dfe6ad41d0af33ad84062984d0f367c41550bda970a27db3bfb29f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting, likely to obscure the true destination of a payload. The 'Password-protected archive handoff' heuristic indicates the document may contain instructions or a password to decrypt a subsequent malicious file, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4999639a28382a5514dcc44d7c717110/bipuxu.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081127919195---raluvuva.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/42008273354.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae12da069---84189806302.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3cbfb5236---gutolomiwokizokawabogu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/65061610804.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cc64047e30899d785a03aa52298fe58f/livikegalu.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/binixokinuwadojek.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bsdlgj5b0bvpugujqveduimkv1/19299917882.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/11bf3f5009fe293f6fa25eb35b28a723/nebodenenumesuxuzerefov.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/1883fdf84822aa00d3811bd744503a2f/51760417768.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3e966869d84182ca869118181ba65e99/26817956909.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d4e48cd84405458d95fa8a88eb5a68f9/47986613389.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/kudugovebe.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/46843917407.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608939d5db9e4---68545225287.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/rukemimaja.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081821a4bcbc---90553110787.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0c3888488a58bf928738cdb271fea12a/pikupuwamobaxux.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/427d526cbb6e229b79b17dbe5e5827b0/tavimavozitifadesalofemo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a42ee975ca6403e6181f74d2e46f743e/toterav.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/35pfv6cf66sebqb70ghusgbum6/28533571394.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081542c9559b---15265197813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=linux+shell+commands+tutorial+pdfPDF 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 18048 bytes
SHA-256: 8cd47fbf4fd293ba530a65de01c342b4215ee6280e0ac4b2d5e942d1e88c1f45
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 11044 bytes
SHA-256: 78a85d0256c6a4ddae557b3cd7c2368cc001337bd1cc71baa73470fc834cb216

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