Malicious PDF — malware analysis report

Static analysis result for SHA-256 e288498effd17ee7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 22:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5a97d4ff0a56b3c8ecdbedd991ad259 SHA-1: b426e11ab121e3f09a0405d0a2229adc99a590b4 SHA-256: e288498effd17ee7438ec5575585b32a15cf2d988351e80a11507acd984cded7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. This behavior is indicative of a link farm designed to obscure the true destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8cb0643---86125567969.pdf In PDF document text
    • https://profitaler.com/UserFiles/file/pekozabakenukukanukag.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bitagidavakaligugo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/83901352314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234d7749c82---goleresol.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/davokijumopibopemuleba.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mezidudujejasani.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6136d07cc---wodiruvuwipifikewagik.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/94475840394.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/84527128281.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/44837680414.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/vufederunexukeboza.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/68768066159.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/64441966040.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/68733286057.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renusidaxifajavig.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151616088319.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3983122ad---xetisodus.pdfIn PDF document text
    • http://merwepizza.com/upload/file/83738924262.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210725_54C0344B4295B92B.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/38168199957.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/19532998807.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf246b8ce---nofoj.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/sumejabudovenavizarolusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pharmaceutical+granulation+equipments+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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 18160 bytes
SHA-256: 65ab7d58e5d1ecca97f5331f3c51da221a490fe81b87446e1eb2523a7ba6c065
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 11312 bytes
SHA-256: bd767fddc585ead90dc03a1c6d5eeadbb1f199b1b18dd8e96964bb8cff8efa62