Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3f63e43375133e…

MALICIOUS

PDF

99.3 KB Created: 2021-07-02 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d90fbd9fff826c1217af19e27c3b9afa SHA-1: b95300334896bbc29e189a9b551696747e7c0bd3 SHA-256: ad3f63e43375133e2b0b65399a95c3bc9e877e1525f020f34ed11ad9547b4336
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, potentially for phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

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://crewmak.ru/uplcv?utm_term=the+meaning+of+omniscient PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eaa023e1c80c016372c2e4378d079e3b/40049630859.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/15184975185.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4pjn0csf1i6iq18a8uk4evp8hs/32615125502.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f09871f1b---zowab.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/bixogexivoritaxuxu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608714009d45f---27978913839.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3186a924---puvukizidi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8cfc6ae8e1ee6621b4efe924abdfe70/99579929798.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/900bc910ff83d0c2e0b2ba6b7d7c49cc/92002042434.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0f299352---45917079954.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec3fb2045---50643990164.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d342c05694---luvezepab.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f9ef1eb---30938403441.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d697aca06ea---77589240868.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v69hifmtt4bvu59tont8n829cu/59176725727.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wixujazowebusa.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/defunove.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/84453933176.pdfIn PDF document text
    • http://tencanpowder.com/d/files/26645492023.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/96861785147.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8f571f9f5---viwetagitudeza.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7379db2417f6253b489056abf1d108a9/12959953693.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070740623768---wupubodukirefijezazewaxub.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/73881361294.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977034195f.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zokalijokena.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 10600 bytes
SHA-256: 25051b87bf8a8bfe8b3b746181b94d45acc5b613a3e7bc7969ac06ab32bd22b4
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 16904 bytes
SHA-256: 05bc92bdb99b27f1a6d8ff2b2271190659b454db4d16507eede272fda403ad8a
font_03_sfnt_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 22512 bytes
SHA-256: 938e2d564066f326a4204fde041eec72e2907beab08100c6f5d995a6b978a555
font_04_sfnt_off0001723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723F 2456 bytes
SHA-256: 1974265f48115be51811dba3d94045bd177973f0a9033ecc86ce8d1c71ad9729

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