Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9a0355b80da0ef…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 04:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cccda7c336b55702f5daea84eea7b22f SHA-1: 1003beebd7eb844556840097722c0c45e811270b SHA-256: 1a9a0355b80da0efd47ff98421737bf8c4d2c8b589a9330e6b5ebd73e217f645
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites or download further payloads, aligning with common phishing and exploit delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=pokemon+xy+download+apk PDF link annotation
    • http://dejede.com/userfiles/file/jepazorusuluk.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6809753158.pdfIn PDF document text
    • https://extractos.assaludips.com/Proyectos_PHP/gestor/images/file/bajujumuj.pdfIn PDF document text
    • https://aokman-drive.com/d/files/duxisidulil.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/54842254969.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210907105450.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/78620735419.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/21500616507.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109040513399907.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/21689453375.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/90996560350.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d117bb6675---98230483021.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/14971445121.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912144514.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161335fce09093---pugirenujaraxo.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kalatoxigipopabe.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lixilusilevatasesurivegof.pdfIn PDF document text
    • https://bliznacite.com/files/62038595698.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/722abe04395021544ce67e4152913359/pimatosuxakeliwotaruduba.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/sagivedera.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/bizerofexaxaj.pdfIn PDF document text
    • http://lulanjina.net/upload/files/30175945941.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a36c5c48---45720841026.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/budidugamuxoruxeb.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/18760010839.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tojepafefug.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_off0000b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 10488 bytes
SHA-256: d0b09a244f44cc281bae3b9c3dcaac1384c5c9a3a46b3dbe361b2c09444d1942
font_02_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 16412 bytes
SHA-256: c4a720db53a8ac521b11602b6b59765be38dd9ef22f11d12b63f493a43c56964

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