Malicious PDF — malware analysis report

Static analysis result for SHA-256 364196253c6c2de8…

MALICIOUS

PDF

88.4 KB Created: 2021-09-09 02:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48a3d59aecdf51dd1be807594a9f6764 SHA-1: 8e6790d231003369f5971621c2ba1035a711a440 SHA-256: 364196253c6c2de8ab2b9ad183d75da03a0f8748a614d7e83b3f8884ef0c5381
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including a compromised WordPress upload, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://wxeina.com/userfiles/files/85279485382.pdf In PDF document text
    • http://htygroup.com/upload/files/musigiposawikep.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/dinowexafow.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/logozagasufozude.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ziwujikeje.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tamevadudoxopakivawixixe.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/sofagajafuwuzipipiko.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7591614082.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/mivar.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130695cb90e1---9091179803.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/ligomabenamukuzidatumif.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/15090248437.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/15539825229.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139301d0c7bc---55138638527.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/90384746095.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/22591354598.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lejedajivefivose.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2qfd42ohenlqu4l6ka8onha1fl/93202791376.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/58569682375.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gepigovupoma.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce2e17abd---92789026470.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/92217773341.pdfIn PDF document text
    • https://asiapharma.la/files/files/58961848213.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/nuxenefosirozomu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/lasubirerona.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/pujag.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///9532408819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+search+android+phone+for+filesPDF 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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 18592 bytes
SHA-256: 1fb0d07fd9c7abbebbae7fbd8764a9e87a2c94229aec40bce53104e19df87fe2
font_01_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 10796 bytes
SHA-256: fce869eab49e272dfe56c2b3d30b2a1c8d57cbecdc233be753ad4e0b0e54a246

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