Malicious PDF — malware analysis report

Static analysis result for SHA-256 e900a23a81178ea6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 04:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fcffbd17a9ca66dca6949d90145e788 SHA-1: af3169c6e57a90c63a4bdde4a449039c8e5bb01f SHA-256: e900a23a81178ea617705aeb9e7af457e0aad98e5ee5b704df0762ee3dd7d4f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links are likely intended to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9034884db35fe705d5602856ba2290e9/94446711343.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4cddb3c1ef269feb3aa59d46365aa8a1/27647581136.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-24/210724003433445311if0x6acr0rup.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0080bb5e9a---sovexepilotonapozulaf.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7epmvsaajbf3gtdh6dm5ie8n1p/8121931782.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9636b95ed23552a705999c2034ffb848/72251983758.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xumilogirazoxavulofo.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/sijuwugixirojowa.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/47737105203.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lojamovezesatiwonexopamus.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/xazijeri.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/zulavonalulezadibe.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/dazipoxavisejugime.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c952a92d900---30458207104.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c07bc6f22a46cc72e993266abd35ac70/47008668515.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cf4f91150---xububulipanotozo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160777121c0f35---2066747924.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/gazotutisakajirubow.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/javemasulete.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/fofixod.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/85946676355.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5a02d9e63b87bb83c99af03f1be7f260/48347139338.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/jubokigutabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=posterolateral+disc+herniation+exercisesPDF 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 10572 bytes
SHA-256: fd60616ea4c359e5bfe21fe1b96ed6f650bd231700f8e1ef1e1d41512ccd3284
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 18064 bytes
SHA-256: 8a3d494ba93adea67e7e6d8fac3de6a297e62d8b387eace9246062fab10147c3

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