Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4661cef9dd560…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 07:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3e868e606c9b604afa69a6217c995fdb SHA-1: 8332196a7e1247193e75b36ab9f89e78919eae16 SHA-256: 2db4661cef9dd5607efa17fa52beb1f2c4b0b7cd9bc6706ca92b9cb39efee527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=nox+security+apk+download+2020 PDF link annotation
    • http://ecolservizinettuno.com/userfiles/files/xozijizoluxik.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/79933990874.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128029c0a7---tepexibudeboxiduxakorude.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219151754423080.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/muxukodavowumapogatuzupiz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d59bd1947---22614952384.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92627663023.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/31409928574.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/finetizodijepagitusuluven.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/sajezadigixo.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/nebelobe.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sovujofamage.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136439817b55---40419828427.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/rixodivenex.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613257eac7812---28849143949.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/85704131255.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/rugopopurofelufuti.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/leduzolow.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/61345691641.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091321110146.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/23993033114.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/71893877078.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/vakizuxozoramufev.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 18128 bytes
SHA-256: 652726e1adb51aa41b87ec2e94cf92db11ad5307e6603cbe40f06b2dd9485d09
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 11220 bytes
SHA-256: 404a24e5adde0d476f9da387bb037b53054696ed8e7d93c6bc055489a88e74a7

Open this report in the interactive analyzer, or submit your own file for analysis.