Malicious PDF — malware analysis report

Static analysis result for SHA-256 638a19f06a6866c3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 19:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ccdc18eca1294d410c9bdccea0d8118 SHA-1: b15e38ff40642def4e1e56dae62a90c6c326827b SHA-256: 638a19f06a6866c3a04f4579d3fdfaf4d38d22c9a9efc7774a10c47372177157
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a94a86bd8---wulimoga.pdf In PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/lenapuxixemaxajezivuj.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/72620835884.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/15652904352.pdfIn PDF document text
    • http://ombs.ru/uploads/files/nujegetamimafose.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/buxenutedilozobewaworov.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/41q4d171augj0qov2is1rkdlel/34954291184.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/xawogibok.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c4eb8f6307939fe2693f3ba1ef6ed59a/sagel.pdfIn PDF document text
    • http://erdbau-rauch.at/bunesijaxejadumozatakese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e08ebbc6---sotib.pdfIn PDF document text
    • https://rosycaffe.com/file/10151036471.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/162864582.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_B68950D521EB8B43.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0d33845d77b36d671474c40783d6a1dc/70585368994.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/logeje.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/mamamorixaluz.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/47588313592.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/sigepunas.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/lofoxizaze.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7d612d7234bbc3e6bf7130102cb309c2/15611751965.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/48876700534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rap+maker+premium+mod+apkPDF 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_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 10372 bytes
SHA-256: 2281b5e15ecae783712c2062ca480bedb09be5ea2e850bf51e2f149a83535186
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 19344 bytes
SHA-256: 387260b9e312debbd33dcbeda45d158e9f5ab39d642d9dfcde165c02bb73c42c