Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f67bb1a0f7e8fe6…

MALICIOUS

PDF

81.2 KB Created: 2021-07-23 20:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d057f90abf0e01643e40e16445b74867 SHA-1: b7a62b413dcdeb533cf426bcede2c80bc6c62933 SHA-256: 1f67bb1a0f7e8fe6be41657dde0a9ff7bf53da00415f88e2e5fd79e368a789e6
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://netmutum.com/userfiles/file/xogenuvunirodinani.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/44f4d1867303082181577721b2cc2e6c/10044367298.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/46757849673.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5aa4d2710005eddf5a4fc4e2096d0c76/tosezovigokiwopixod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/69da31e0057f93702c66b4990e73ec69/pelikixijuvufanis.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/73713551156.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e6b54deb---23051798690.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a912b3e6fdc05dfbf51460cba6766daa/fisasasufe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfac647868---voxinul.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/48991958466.pdfIn PDF document text
    • https://12shio1.com/contents//files/93786767585.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1a1a7ea981fd4ff48f08f0e89c4f1fbf/99034576207.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/69726397079.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/21253000567.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fae35c51354---73170714220.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/66774841142.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/lipizubipagakarep.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/53357200130.pdfIn PDF document text
    • http://promador.pl/userfiles/file/dagunapasalixewirasajibo.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/ledenapibatezitesax.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8806445e42ce6d0297159ce3ae4d5ec9/62329674896.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/nogibiruwanuwosesod.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92580a815---tixukok.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc188702f86---xeforajaxa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16090ac357a09a---kimusudavoxejukod.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083e241eb9ec---95461197861.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/96571841841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+heart+gold+rom+zip+gba+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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 16672 bytes
SHA-256: 465601d665f553d40e63feb9b768627ccc28172e6f49aab22797915a5a0b3cc8
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 11052 bytes
SHA-256: bd6e19700a3c8b4594547ca1114697d1a4ffac954f4dc22ce0b2d0e4bf4d44aa