Malicious PDF — malware analysis report

Static analysis result for SHA-256 1744afb939a065be…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d92c2746c0650ba9ca5a7b344332d7e SHA-1: 2f84009110bd654c168ee9ad22a0c1dbb3e2e943 SHA-256: 1744afb939a065bebb97226977845ad2ef5a849b9e1f95819c6bb62650360d85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or spamming by redirecting users to potentially harmful websites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+delete+all+app+cache+on+android PDF link annotation
    • http://morethancars.nl/uploads/edytor/file/motigakalajix.pdfIn PDF document text
    • http://tzsunup.com/upload/vevunoginevojomedimideloz.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/98300238186.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/12516606186.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/duwikasun.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/70735624190.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tilopisowafadokakerab.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/tovugawon.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/40e34a0511dc6eb4f931af7443c9b984/75283540679.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/zasirepizivaxaluxegadeben.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/89291527565.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/87128265323.pdfIn PDF document text
    • http://gaudi.tw/upload/file/jewozusidifan.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/24147044209.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/87986724594.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b1971cbafaa1fdad356ba348bb224ca3/62410210015.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5dd41874---30836713154.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_CBE7DCE53CF98A35.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ciu05a69rgvfhubo2i33r1ffm/95664579696.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/33842953123.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24481178813.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xivelakonejedowemij.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/96087118732.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/56e9e834f083decb8a6b47c4b5be455e/mixuwedixozumagasibebib.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7af62ecddc036d0c017463c538bb185/gutukinu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 17948 bytes
SHA-256: 9b53633c7d4d92f3609814b89e294437b05df95a961c04b06655bfab0b024e27
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 10520 bytes
SHA-256: dc10cd919839956ac78035ebc47a03fa461f09a2aad44c85f766870fd7849031

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