Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f95d2afc139dec7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 17:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acc3aa01f2a4b29ab3b435d90b2bc634 SHA-1: 396c7e6f6d031119f686918ac7573d77118af3cc SHA-256: 3f95d2afc139dec7d63caae1d545bd542bb37a0d7a93871893997ceb0a03fb5c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host other PDF files. Heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac649593804---jejupomuxipogaxunakaxal.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r1bla0akd4nl85j9t6fak1vhp1/17849480813.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fecgt2rga82up97duafq4odbe3/9487927295.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gakokodolinol.pdfIn PDF document text
    • https://airshow-bg.com/file/tiluruzolaleveg.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fbdc3f2a---gebudisugusidudimelezepog.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d99de51ac---56130529189.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/siguxovaga.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05e5c0241---zekefesovawizopariwog.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/pesuzulawivomawaxiver.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c58304900af6479172d7938a338d94f8/wepevimabumi.pdfIn PDF document text
    • https://signika.pl/Upload/file/kurodezelatorotiren.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dolavukusunetinurasuxe.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/lamuku.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/xufufut.pdfIn PDF document text
    • http://bptramptour.pl/files/file/99724011428.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c005a04ff98---27842390750.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/suvive.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kezugeleperubadatog.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a974f2d45---11749050755.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a3a9037457ed886d98f06b7d264d08c8/dizajedomofitonavirin.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefff4c06a---91238758826.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bf7df98397788ee63879ba27ea765d29/19012554888.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wenavixuxedivitine.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jisaxebamidatevukesubonum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=honda+jazz+2007+manual+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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10480 bytes
SHA-256: c014b8e5d27bef53ced053f289a7d3fa90021a4cb654886ce82801d0aa937422
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 18180 bytes
SHA-256: ae5275135663b814e51d58d0f7f5afd12fa0ac5d864663f37a3950ecb0d49569