Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a14c1f3d7667936…

MALICIOUS

PDF

129.9 KB Created: 2021-07-20 10:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41b08903ab21618f4b745f7ed58811dd SHA-1: fd866576471a16d17cbfd493e90dedab60b498fe SHA-256: 5a14c1f3d7667936eb00f1fbf80f242042853f26833a651cd97d8bbfdb61e4fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/65qpsntslggpcba0j0hl0q8u97/64195853700.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/resakopiwadep.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9bbce0dd---76008008376.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/90008273554.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bca9c25950c1e793f15e9be5b5ba7811/rasejodojagubajumali.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c119c3870fc---96208580337.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f32b1199d8---laxuduzoxopatibejewi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e985f0eb0---wuwesimol.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/627334a29547ce7c442cee4b11a0b337/20230126554.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f801f2c8---4015008009.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7733864ac7---83304383822.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/b021dvrbvkj2l47ip5ml2no2ht/lomaroj.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812b3a1f165---wewekififapix.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rdhh3i7rvj309b228l1bui10i3/78756291032.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/jepabutirowevanaguropin.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/geguguxovudilogegoporej.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/54acfab16b345e5666a441681067f468/29549579210.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086a46cec01c---telidizisuxapogopipolul.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/54023337034.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e5ebfa8a84cbfe0687487d56f305a5fd/pirudupukegi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e56b4d87db62afc75f2c00a12c261c66/38402130914.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fdade03caab111832797bb5ba23a1905/10440696606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=her+face+launched+a+thousand+shipsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18886 10808 bytes
SHA-256: 0e8a3cd7d0449b8fe09c3ec088ff2814c16904703e7b4eb82e425dfd1d0500b6
font_01_sfnt_off0001a143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A143 1800 bytes
SHA-256: cb2d23ba59d6fab898ac4861c5a4e22643c1fe5c039578fe3c63b16aaee6607f
font_02_sfnt_off0001a9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9B6 22236 bytes
SHA-256: 301288fd758d695208c5f94c1ddac7f74d87850d3523d66b15c053176d0f42a2
font_03_sfnt_off0001e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1