Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4b0dbfc68cb90f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 04:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d07fa8e344b377fd55e87f8ab7053d20 SHA-1: f990383af2faedf9c317175885f557ea19e1f66d SHA-256: de4b0dbfc68cb90f2d310dcc1fa86f598fa18a20fbd6a6ae3417b88c8a1149af
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards exploitation and potential client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://aksaaydinlatma.com/img/editor/image/file/xuladizu.pdf In PDF document text
    • http://mopron.ru/upload/files/83841560332.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/dirimobasafowivujonevesu.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/bulofajenokafigugomafi.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/6091000563.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/duvedixurupu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/76159373342.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a9b0247c4---tububamibobal.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14d2055d3---1949857704.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/tukojazosowaliwurazefeda.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108251124185126.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/cstcqqmer11vbsjdblaltr24rc/lagatugenunatotozetibot.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf818001f---82531067779.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/88810338789.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/5855534103.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/66173295922.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kujikajizanebebam.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608789cdee322---xufuwumino.pdfIn PDF document text
    • http://lawngo.net/fckfiles/80523209991.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/6709698280.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc428e24a3---5042220237.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/muguzuxem.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fovagasasisebedasanapad.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u8ie957p74iqc2gqj7b5gg19h7/jurinuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2008+mini+cooper+clubman+s+manualPDF 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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 18744 bytes
SHA-256: 473136f665ea08f21a6341dc9e383fc62d6da341f57fda49ddd4a2032ecefe4c
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 11032 bytes
SHA-256: 9154d27bd5929c65534505325128e060ca837928c8c09e8af9e558495993dc31