Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dcdd75a57a1013…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 09:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acea4e3e394b38f620cb609e9902f6f1 SHA-1: 5b6840d710cae3cb3ace349089571f5d902b58de SHA-256: a9dcdd75a57a1013ed5162f77d71c7adac3db7da142e4be7169176ee55419871
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

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 http://koszyczarek.pl/userfiles/file/damobadezejulerujo.pdf In PDF document text
    • http://halmar.info/userfiles/file/libemuxuzepogu.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nemaneza.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/managuvodem.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rgbheg4flkftcbmivct46fbf4f/zarunazup.pdfIn PDF document text
    • http://shahinrouy.com/files/file/duvujot.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/daa6dd8b25b2c0907b3999a85dcba2c2/begaletolezelosazedaliv.pdfIn PDF document text
    • https://invest.pl/userfiles/file/46896961345.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3435f17dd---68911564102.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/59882353255.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc307b7eabc---gafegelukiwekowajarure.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0b8b68555---rumimikosetorudogatobud.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/465b16bfb8c666d99fa309d6824f0c79/18830534662.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/64135d2ea283774903ea38c35ce34d53/26920757481.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/julejotazumibizabakazumok.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/05e980bdc1dc07091f395df82b6e1b15/bosasolimirifabi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a37ac820d---rojirulukifapaj.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/razakitirawipawogonofe.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kikoximejo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0177398f9b9d168f8af2e02740de179c/59804583704.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/rixuzunewesavuni.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/64nac7belf6pnrk1m2i7jo7bk5/xugitabobuzunix.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610116de6458c---gawixenenanelegimorejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=time+machine+book+pdf+free+downloadPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 18372 bytes
SHA-256: a2ffa936eb6886afc9b80031b149215893bf4af603a95554a9f81c2b226e64d7
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 10900 bytes
SHA-256: eff09b8fddcbab83644ce65d3a304b2281723c70113bf01c6103411f0a039ae3

Open this report in the interactive analyzer, or submit your own file for analysis.