Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de07770a275236e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 07:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a6285d260d10d2fdcbcda570c10edf7 SHA-1: a62a08d62d5c72ebba156a3e17e7bda91fbe8065 SHA-256: 5de07770a275236e3fd10d4443f8b6f37bd042cf4f581684bf1368af261a9982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://salvamontbihor.ro/app/webroot/files/userfiles/files/lasij.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/99078ea7d24cb0feccade370c4188189/61102197524.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02f4e00f3---56866867519.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550f6e18f2---wedudonoronalipi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75fd2af629---28066899001.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/tefejiwigaximitipitokab.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bf6663030609e107a5a9100e60a1234c/subojomufijimapepugosetap.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/17836593197.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc7p9amq1nu0cjtlisjmaqsffv/73985987294.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0vd2125bukpg8fnkfkmdpdivl8/siviravamutamepamo.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/gejuzigukosefonoto.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2c260e51---junisuwakivumojunejale.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/014717235718e237c7b9b0a9e31f3df9/kosamuwosareku.pdfIn PDF document text
    • http://fotoprint.lv/downloads/file/nivut.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161153d660b33c---miwexowevo.pdfIn PDF document text
    • https://steammining.com/userfiles/file/buxawuvaxagamoz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa54d166a21---81449558915.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/gabozu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4f87ffdd---11701211863.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610837b7113b2---bimopulafomexiwalajubawa.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/dezusisajigipufezogajasov.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f983b7bf512067a1202c5fdba6ea4a2f/muvuvusolumiwekomun.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/61432182004.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ed6b6300---jotufoxew.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sojexilusawimozudirudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bases+for+town+hall+9PDF 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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10524 bytes
SHA-256: b384e23c2779aa50bf6d663c1a784f69dcd6f428691041cb2976a7547cb3f616
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 18164 bytes
SHA-256: f836c269b6bed2c43f651f7b2ce62a5ba7fb4a672b5bd8dd9d6684e52bbad540
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1