Malicious PDF — malware analysis report

Static analysis result for SHA-256 250d9ecec57b14a0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 402192fe395f42ed176d570d00dc959c SHA-1: 4db8c40e44bfee75a37188c28ed64e455311f241 SHA-256: 250d9ecec57b14a0214ffa704940b2934e27fa16edecf624d9a4d8ce5df865ad
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bu1khg9cvsifpjc6s5bcov0jn7/50885024986.pdf In PDF document text
    • http://ruresept.ru/files/file/44978234347.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/xefopisejufu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/wijalex.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69721243329.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/49726488612.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/97844601539.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210908_FF7A52CCE4D55F1E.pdfIn PDF document text
    • http://synergyproperty.com/images/files/37847263438.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kq3ieel46lgh31kotk8i5t7rui/95957302954.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/9035815647.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109012155241858.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2a948365a2b4a3624b1c8d101bc47608/zikub.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/terofolajawetapevixikodip.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b6cbe41e.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be195e5f4---nefuzikenuwi.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/peken.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910135323695753.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kalefujoga.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/nopixumojudabob.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/57306195486.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/kagodobokuguzabipogekuvor.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa75ccb176---51965217766.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zibowugutenefeju.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/32521462775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+delete+all+texts+on+androidPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 10420 bytes
SHA-256: 7ab375df34308b2bd211803d8e9b83dee03d5e1314cdd886eac3dc6c42d704d0
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 17528 bytes
SHA-256: 6792fc7f8ec1d013402973a7a962836a25633e2ce583ce31206e44ad19c26f9c
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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