Malicious PDF — malware analysis report

Static analysis result for SHA-256 0284cc67b14bd48f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 15:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 00e33f6be2dbab9c0b894a6b7921d002 SHA-1: 3d32b2512f17c97e5f186b6b70aeced82d52efd1 SHA-256: 0284cc67b14bd48f6488ba4fefdf1691975c02e4cf10054c1ef56600c7bcb8f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely directing users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=best+ad+blocking+apps+for+android PDF link annotation
    • https://alarouba.com/ckfinder/userfiles/files/pogemaluzajoz.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/360003_10857570289.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/88690437566.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lurazabawixow.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/88692482154.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/95889419867.pdfIn PDF document text
    • https://hobbypet.cz/files/file/lokodasiwuzotowulexot.pdfIn PDF document text
    • http://gro-felix.si/uploads/kajip.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8882ac2c---duvodiwikezav.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0v7ht6rid37n9rprc3h0mka3as/zexisusanupevufuzilibe.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090208143273499.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210917103253.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jurosugofavupolitibule.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/gijedaseme.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/28502914442.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/zigunadoz.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/53386894534.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/89350517095.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/fakowudabanisedubura.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/88266216302.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/80462412611.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4cdaf4c3---48189763221.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/xiwotenaruxojin.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/4449699150.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/66102248170.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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 17116 bytes
SHA-256: f18715c05f5b577a9e9c5f535f8d6df7e26ff92fd72e6ce2a351e253f91900fe
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11080 bytes
SHA-256: a4c40e790ae4c06f89de462429b1ee9bc69fa37384ba3535d43401b38b930c20
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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