Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf2bf6cbebe545…

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 13:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c1329df85a38323c2d06f9af22c85838 SHA-1: 3d4aef933008c1adbe630ca3cc8cf78acf317abe SHA-256: a4cf2bf6cbebe545bfaec9c4ab18f63f377dce053de4f3f4a9982565a2e1ae7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb5a7e221---vanulunugegejisol.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5c86afd7937942095e2355be518e6ebe/mirimotiginur.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/acca4821aeac0f8f0d329d6fa55498ba/5426385337.pdfIn PDF document text
    • http://zuche0551.com/upload/file/mepirixezewoja.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kururobazujirubowo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85edb53c9---nesusepetudupemisejekik.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa0327c4c---roxagukumofafugajigirowud.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/388afdfbae094b5b0f23e80f02e81e3f/saxodurewibunokopa.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/49191719969.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/xafibufalep.pdfIn PDF document text
    • http://stevis.cz/files/file/44334591648.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/296608301.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e7f1e584---tapeb.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/55648392187.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b452686f362---zudijorelogemij.pdfIn PDF document text
    • http://uci.ir/userfiles/file/xubupunesinakoluji.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210610_083325.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68ea277da---33276919927.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/dobogafatimezexarozizuja.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/30881298327.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c1a7e776---kujekowarawu.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/zudutopa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8237a6864a0a3686519c45149918ca27/viwulizifomexulofogib.pdfIn PDF document text
    • http://katachizu.com/img/news/files/sidegapasaz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af0ecbaf4d7c14c0b153f0d67bb8f001/rulabimi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/30ada686c2a5ff00fcdde0c5beec5031/326431008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=como+configurar+el+control+de+directv+un1PDF 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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 10900 bytes
SHA-256: 06ccdcbc060e4c622dc8ff1ace55a2c8efcb739d114917186f0161b0097afc5a
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 17984 bytes
SHA-256: fcc97549e1209d6852238d309e17d0dee53aee259861f1ab8db785d709b42dbf
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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