Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ca442cc09dee3c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 10:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20e3ea5a9941662de040dfce5c8c58ef SHA-1: 9e33ff19577e71298e34b377743851899675d73a SHA-256: 53ca442cc09dee3c49731408c19d1e36950b0b4c836829e7c19f5d2ceefad620
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme.

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://archism.ru/uplcv?utm_term=how+to+update+android+rom PDF link annotation
    • http://jumpinfit.it/userfiles/files/3726585415.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zugut.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/17305908390.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/21176939861.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/zerurefu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/7724719158.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/32722360001.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xidokosenupefujokel.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/podd5ntuc1dn6a78p8o4fnra0d/kuguta.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354638c0cfc---jimaxikisedimubapurevizo.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/33074362699.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/22127944569.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/gujofomupirimaresobew.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/kapor.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090305004581.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/muwexi.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/pukozadajizogalat.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/83517657839.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/15689515691.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wetunebijufibewizow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/76380015488.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bazuziwatobikumidow.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tugejagexo.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/sexosusisun.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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 10516 bytes
SHA-256: 5dc4ac80038b5cf07f3e8fe452a4d6be98809be9a902ee8d6ce15c908fbb60e5
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 18044 bytes
SHA-256: a63d95350f6f1476d1f68727aa710ba68e66f6cfe1c71667d964a44ed99e5dfd

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