Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f375cc3b7362db3…

MALICIOUS

PDF

80.6 KB Created: 2021-07-07 17:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79f821eded26d589270d0fc2feb63c69 SHA-1: 58ffa232a4b3cebcfc3ce4a140fe527d33b35798 SHA-256: 9f375cc3b7362db314bc6779230cc8744fe72c8cd6b74cb5a9c498bae7f4a562
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mmszke.hu/files/file/tolerukimolexoxagesifaze.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/70d676121afc243209e47789ba5715aa/36664291439.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/46246798625.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k5csovdvdvnhu5iuf6gc2sorc3/73515147134.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wenarupadolowe.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f79ce0b21e2cfa8daad5579538aec1be/9119747295.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pugogedaxivafe.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bosovifebosaboka.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/27446069.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7b471b4f8c10654c51d8bede1a25149b/38441385254.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6h8mdltqf8ltr1l38e5rr5l1rh/26008574628.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de296565e66---97453445541.pdfIn PDF document text
    • https://unosms.us/userfiles/file/40932047113.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac43d8889e---1294945997.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/putasokovojazuxuvew.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/afa4c8c44b7f21eec575a6ebd226a239/rejebub.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a589328eaf6---nekumibijob.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/k1p0js61p0otmgdh5enosug15a/vokoxanafilujo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbb115676---17045435957.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a8f636810bd06deac93c4d0cdca899cc/24812602774.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b6fe9599---jagamamunulifipapusovu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/744b1554c7320a1d3978bbd4b9c9d7b3/wogerepisolo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056771c36a---wamutato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+power+pdf+software+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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 16952 bytes
SHA-256: 3782f7b71f315f769001a84b1cc6e98cf963e09be5611e4d9f7d1c4800965998
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 10464 bytes
SHA-256: d710b20e1ab42c2d0564707b545d3c98dc30394d0a7d089659579e4e37e3ba90