Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a1e13b7eea6ec9…

MALICIOUS

PDF

83.4 KB Created: 2021-08-23 10:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2d92ff7fea2729852ec7c791a4766c21 SHA-1: 8642122c784905addf963fa5a7e184501113a734 SHA-256: d9a1e13b7eea6ec996ba04eab15d0355f112d2e824f11cab98500a1ced73a553
156 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. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://archism.ru/uplcv?utm_term=tue+sustainable+innovation PDF link annotation
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kgl5bje1b1dgacehoj7o1v34r7/44496312675.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/rusoluzukonulebozeto.pdfIn PDF document text
    • https://o-dance.com/upload/files/85118953259.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/dakene.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9d491304---77749375594.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/88deecae06600a2099e1329c09f973c3/85559787358.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073875cc5064---3933225789.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c79c0a6---kirasawevufedaten.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/vonew.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767feccb096---fuxopuwunilurutagom.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/18435329850.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/vifuzifomaz.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/pilomirozagawolikenu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9221700aafa0b3aa2ff7d8bd7450169b/xojotelug.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/50877535275.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/danavijovojerewus.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3f969061794b9f1721f70e18c0ab42d7/zafedinipivunefewa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3f9704dc---kutubamorabaro.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/762c2fb3a47b157ad7710d19a072628f/zukinisukerajiwegagemene.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e6fba0dbdb8be189f857d02dc02fd5d/javopefazoporatamurik.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8c42rc2sa1fd4tdf4gqmaf5l2h/xikezeno.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ca9469518450bcb80be1bd5e4e5951b/xuzowajanasafotik.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/2731223859.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/24162523574.pdfIn PDF document text
    • 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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10272 bytes
SHA-256: ca0a7d2af32c101f6f877dc48c6da80b474cb09b694573d5552468685aed437e
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 17060 bytes
SHA-256: e3f21afad6ad8afab93deecf6b21748f32c7b758c6951cb02e7727554bf00d99
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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