Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad458d98aa60971…

MALICIOUS

PDF

132.2 KB Created: 2021-08-14 21:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1ae556293ab1ea812d0d8737dbbb7d2 SHA-1: 39680780e1d28b859f7513217d69a0b109251f04 SHA-256: dad458d98aa6097114cc3876116af85e91f0698dcf0df7ba217b0ed7a3089834
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to manipulate search engine results or distribute malicious content. While no scripts were directly executed, the structure and the ML classifier's high confidence indicate malicious intent, likely related to SEO poisoning or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea65eca83d---59588057783.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24843da37564fcf43acbac1d6fd0fd9f/lamurufeze.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791171afbd1---mopafixebezonumokobexanon.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kimebivuviwuz.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/63286359670.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/gejojifosemezubujazifol.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/zulevo.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/17487218776.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8604fc9a36c6d1a0e969f82a45d8735/guxupeba.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/budapejisakapufaju.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xusopezezotin.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefa59a472---7011028668.pdfIn PDF document text
    • http://waterreducer.cn/d/files/juzebebaroredufafojipoka.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622790519556430426.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s9ljsbpsbkf7dnqg1l2pbcdsdn/89479847072.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ffe2e9cf0ecfd1ac3b7e9ad842778962/kosopujibitajiv.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca21ea10d---vevubolalodumilegusi.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/876185164.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/72160754971.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d2afe6509c4ff5e08cb256fd0e7c867e/7998792585.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/26016036265.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bg547mffb1tam5o3j1pc25t5c9/60245844826.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/30286029105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plantillas+de+letras+para+copiar+y+pegarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 23908 bytes
SHA-256: d4ded0f335743f3188a60b6714296d0937e40e67a05ae5ecd3ef1540c6d83727
font_01_sfnt_off00015841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15841 64044 bytes
SHA-256: 05e3b4e76bbac38eab07e0fe679280db03ce753346324fb900322c98c72a899f
font_02_sfnt_off0001cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7F8 10804 bytes
SHA-256: 154720a85920eb76174fce9e83ae73c10b6174935676b915dc3d17d0b5d8ece0

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