Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce8c6e4580d6add…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 07:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f28f8fbbf638b90eddd0200160efa08 SHA-1: d3e16960b182448c5d4d193681dd3ae785b3c0d4 SHA-256: 3ce8c6e4580d6add07bbfec7d8f2d3243960ee81d7142c39ae42867d0a8a58f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to facilitate the download of a secondary payload. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zanhotel.ro/beficientconsultingFiles/file/fovixutidalam.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a28922f0---19001674127.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e643c47d653---fudenarevenozuzir.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/tekopuzapavaxeda.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/10643823079.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3680ff09b7---dovefebo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092296695ae2---letovovip.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/mejakutamolu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/241a3162ba27d17156a2e4386f8369d7/zavoseletudunokajazoxaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf72decd56---43692118509.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/natarubinemusir.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b22c5121e2808b57db1bab6290555e4d/40057984433.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xanabajoletagorezifesasa.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fafimub.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/diviguzigij.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd0adda2b3---gekusaduxinuweseg.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612738c5406e8---9642734986.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a6a99bc3d---63769509705.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/eedb57a3f1d79f7e842961451368b1ba/vejajiri.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/44d304b34f190e9e130aa437991f0f05/maravavozosizujudugawusab.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/15249377849.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/12f181e5fe5061536638e644fadeaa0a/89702348681.pdfIn PDF document text
    • http://vkts.se/userfiles/file/27778257200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=amadeus+basico+pdfPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 19640 bytes
SHA-256: 000d7d8841d04312e4ab78f11b36772497cf02dceebc51fb1db559c821880711
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 10652 bytes
SHA-256: ba37e62fd40a263e205dc81f9e55bf257bed2bc68f4f3f3b0ce028c856cb5a59

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