Malicious PDF — malware analysis report

Static analysis result for SHA-256 64357d52e3213755…

MALICIOUS

PDF

116.5 KB Created: 2021-08-18 18:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2184acfa7dff0bdcee2b3de3aa92456c SHA-1: fd8d05e9398d80364791abfd9b050a1d612d5abf SHA-256: 64357d52e3213755b99876f11e63904447c1323a7737c42d1577b8f6ae139fa5
156 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. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

Heuristics 6

  • 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.
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcea446bd1---bavop.pdf In PDF document text
    • http://ahchala.com/img/file/tetosugu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gudobuxasekozipuzolojijuk.pdfIn PDF document text
    • http://bakoca.hu/files/file/73802838179.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093e915c9d00---72898273373.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/408b4bdf930495655b50f5a59c1dc445/tudagin.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jnj6anblt42pm2vdf5o0pmln70/82985055790.pdfIn PDF document text
    • http://elskenecologie.nl/files/tetigorupusiguk.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/17a072258a8f6886c6014b5f515940bc/99646709268.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/61302607123.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/32771611003.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/sinuz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4d6adbba949c9b2d92a367b428de5423/nerinegalonibuxan.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6609a76a---siwadigoveriderenadeg.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/folixefakumewit.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/78bae754dd318a22653188ff345279b2/mozobexepujawinujifi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0ed87127---poxuzezedopilonoman.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wixifatafipowetela.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3fd440a5c3923cc08a6dcba6fabfa85a/vebilivivumufik.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a604bfcc---tekapigasatibolepuribate.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c6091f01---81767937036.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608238433918b---ferutijava.pdfIn PDF document text
    • http://findplusltd.com/file/getokevulanikev.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7dcteeb2tc2942v887mtegovee/guvotitilusojuluj.pdfIn PDF document text
    • http://kccmaul.com/files/files/zediwuxefap.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/visoluvevokitojakolabox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=despeje+de+ecuaciones+linealesPDF 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_off0001477e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 10540 bytes
SHA-256: 419b7d778d2f7b9d12c04a842f2c77fcca4475257f1fc09d4eee5dcf6fe2cb83
font_01_sfnt_off00015f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F95 19688 bytes
SHA-256: eae6bb4d50a7a0ee8ee1d39cf7ae2651bea93e0a1ead595a4173a5b704915dc4
font_02_sfnt_off00019325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ab36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB36 16412 bytes
SHA-256: 9f3026b271e44e90efba33de7776ed5faab772ff066414baf52c42e597fa0a2f