Malicious PDF — malware analysis report

Static analysis result for SHA-256 b453f82bbb2e9fab…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 02:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f13a6c395c5bdc416c4638b8b5eac75 SHA-1: 3f452112c8b596203c40a34aaa4412c9a02da1af SHA-256: b453f82bbb2e9fabe88bbe3f2c6eb4b4917523abff2df59e19dc7c4a01080cd7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://flightshop.jp/images/blog//file/30494498909.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3f62c946---54948369576.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jvnqq7v5egns87esblf7skjfgf/gatesaratunixikipasin.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/fedoju.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5c0b9d9b7399c2e7c453632ead892209/42064532645.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/jinanawavikabiliki.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/33114163580.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/tifusexujigitajimerow.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/22861994858.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/10561351492.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tudusagibojavikosiwofi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xaxotametaliwapupizuxu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ede006cd0c56bcbb7e24ebaf6393ffaf/popoz.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/gegima.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/jaliwi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2b774a2---21850402669.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/n5dsgob9pcunfb6nksuptrkoho/96187483813.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/aa7a50605a04cf35526212e0d3829e5f/jibemox.pdfIn PDF document text
    • http://mosjob.ru/images/file/92342001225.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/me4m0jffnj1ce6fb4567n38kt2/39964521827.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vuzofoxokaxumorijifirofof.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/7282300987.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+a+stimulus+check+taxablePDF 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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17156 bytes
SHA-256: c658d0c113f9c88ffedde4ef89fd0dbe4e723c4837cc6acc34df287744561579
font_01_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13952 10556 bytes
SHA-256: 0e860285489865a225252c42a9acaaf6bfcb7d09cbbdcc4b1123f901acf5f53b