Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aaf7a92ca7c750…

MALICIOUS

PDF

103.8 KB Created: 2021-08-18 18:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 013452d8f456e312eb29a695f205d455 SHA-1: 14f7844bc8a5c055027c3e9d8505c51a5af94ec8 SHA-256: 36aaf7a92ca7c750b3909d2e13c95f5c0946132a9f1eac2c75f57b6431ed4415
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_RANDOM_URL_LINK heuristic specifically identified a link to 'http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lixovudosef.pdf', indicating a likely payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=descargar+libro+historia+del+mundo+contemporaneo+santillana PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffb56cd498---jizupifonamewofenabamixu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fixojigiduvakimaxepabugu.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/61952327908.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608725e88e1c9---41476721952.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2b48f028---17405331780.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/gedosipifowudowes.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0183307001620318783.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/81170246182.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lixovudosef.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c0e97983---nuguvixolefikonojajireged.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-14/images/files/29939629507.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610adaf59ef97---semug.pdfIn PDF document text
    • http://carszana.com/image/upload/File/vukononawugisipu.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/71269184651.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eccc06dd---rolixadalonupodorobi.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6eecdab4c866ba1a9179f3d7fa265df/48924357958.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073aab625e69---jogivopitivareliseziludef.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/71639797106.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f974609fc9b---23198996054.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/au59lbdghp0r738sqeab5l2quq/68170417757.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/kubelinene.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f882aa7c4d---69201053503.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/41410948786.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/60443032584.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/68600978756.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/60679481131.pdfIn PDF document text
    • 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_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 20148 bytes
SHA-256: a2381f35bcbbf78ebcfe1de0f36dcac5ade0a439a6ec45e7674af8dd3758e683
font_01_sfnt_off00015e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A2 11204 bytes
SHA-256: 478b61b24620e4fa90a8df73c4af9e35ebaed8c34a3e6ea1672098cb08c575b3

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