Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1149f0dcb10574…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 13:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a77c662867ec5079f17155eaf563ca1 SHA-1: abd5da03f4b8ea56592a6d011f13b2d1df9def2d SHA-256: 9d1149f0dcb10574d83b2a3123682aaf70f88b84688503c73bcaf643fa8acc91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users to phishing sites. The PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=conducta+social+definicion+pdf PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf81b6e759---kevanivunowibe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb5f4d22d---situxuw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d074d12a---46896401917.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e7c270e6---womijofodexoma.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095205379556---75356817992.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e910cfa757481a3664e0a731efdf461b/woniwakofesimizogitifojin.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127703f03f50---59353621533.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9l9euknenv4tfnlesf25dpe353/38296639039.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/87092816556.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vt4lpmggav90u92qo2qtldegbu/86911866298.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087572d446b6---wokemugukifigewoxufezeze.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a562ee1233---20999991496.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sirafudonotanodivogedu.pdfIn PDF document text
    • http://armanetti.com/images/87732607412.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a7f1982c79b8ad65aa8fb57898c48fe0/44107196737.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dj753oipbpfj61g14o7q9j2or4/muperinopaku.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0e5dda45---wojesibepatinivizulum.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sanewiri.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d95c69912---70476330264.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdf7f3eeb3---71551841289.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/63430797438.pdfIn PDF document text
    • https://mszukam.pl/dat//file/komodogitedeluvavole.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/66560692101.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/64413632083.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160935316475dc---3656932109.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bekekotapori.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_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 10644 bytes
SHA-256: b045fde4c383d87969e8ae806afa03dea0b529ea194b4c728c4d44c454d55304
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 18968 bytes
SHA-256: f175e7248cd2c598a7526b2c8e9485b09f7e9a2be687fdd71801c8437cdc9b62