Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0afc36fcfc14599…

MALICIOUS

PDF

80.9 KB Created: 2021-07-07 23:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b3ab8fde74fab511b0ec36d5870e67f SHA-1: 0dd44432f95b9e35a667d73e3caddc01275866be SHA-256: c0afc36fcfc14599f4e4f46017ad3f1a8449d6f66d3b79a70778340083151f42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content via a link farm. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79eb33852b---fawetasetu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/6bef8352800185fd565963e7d01898b8/11131408900.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160934b2cea104---gutepapawegabeju.pdf
    • https://windfreeklima.com/upload/ckfinder/files/56338244554.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dm8cndk51gjn8uml2pvflgpqoc/begizibusiguwumatevelexar.pdf
    • https://triosms.com/userfiles/file/gavibuzobodu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046090d977---buwiwuwegojotukuwaw.pdf
    • http://archerelectricsupply.com/userfiles/file/buromebasos.pdf
    • http://rgn2u.com/userfiles/files/60203014935.pdf
    • https://costabravas.com/uploads/localidades/files/11386574880.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/72754527722.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00bc350b3c---xuxuxerepanuposoninozonew.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da93c72b9---5092290015.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23afb9483043aaf8c882feef3877d4ff/jazonadibigodizototituwe.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/64729322602.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ed810a97795defdebd3e0848e7a9676/rojadegefo.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e9343f0b22f215a3333dcf0069c566f4/pezumasa.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/97328bb3a05f7635971a01a663d09e0b/wunez.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3aa9f430---zupupenovoru.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/nelopagipamukegozidar.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d54d29ccd---41457176427.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c62bf3359---542806602.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+does+outside+mirror+restriction+mean
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d914.bin
dcfa8ab3065beb64362b9ee3649f68a5192e2386dff7fcec4fa9b679330749da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 10684 bytes
font_01_sfnt_off0000f16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
font_02_sfnt_off0001097e.bin
99930803aae4300a048b95089d4b3fd29fe976843c42447fe65209abcdbd2fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16560 bytes