Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ac611b96a593aa…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 19:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92adeb2cb17dfd2737de60335773812f SHA-1: 17867c6535600384800df5703efc9e43a0cd1532 SHA-256: 09ac611b96a593aa5bb0ea31e61a8b5d3e309ae758cd585054dfe133f7a6d86e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://eravukappalpalli.com/userfiles/file/65103607425.pdf In PDF document text
    • http://huerural.com/uploads/image/files/82644595456.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826fb96e49a---85610174994.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715d1ea526e---28693763663.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b553e5ade6---81619387854.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/somojuxojunawawiwus.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/47b61a6ca5e65beebd4e7a4b93cf79a8/24898451721.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j5umhlvm0imh3r110i0gghfmiu/zukinadozi.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/pebuz.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/oii1iiu7i27vef4arifmna9ee7/64249135844.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/fixasisajaja.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f7a9026658190498b86d9bf39192485/tudiduso.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ll42hi2he5e7sbof9tdrr7kejk/gefuzebapofumevurapuwo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/50616279478.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/90251924447.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2f6a5622---21213794909.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba78e5945---8752559974.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1b66d13e---nimirarezobox.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210529084203.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/84868155673.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc53cf03fa---xefevulopigu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6697029927.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/60841071342.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/resanusebukatopixan.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/lujubulojuxofuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vivosmart+4+user+manualPDF 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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 18136 bytes
SHA-256: 77cecfe7676c35accfd3f59016e6570d73ec27da82ef4a497104d9d99a5f567e
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 10484 bytes
SHA-256: 4b2a0f0fcbc1e1e7e20b7baa426cca111aedf53cb7a4ccacc279760a317af6a6