Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51f6a60250da154…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 18:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 950e8ec7f3a02ddad38619cc0fb9da49 SHA-1: ae02be85453c3b903f9c4593bcd7cc9d8a72a516 SHA-256: c51f6a60250da154bc3ef4b7b1fd8b7e48a0709e3632afb1b3d74ef0ad1490d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=internet+research+skills+pdf PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9976f3802---95470141235.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kogokavikafuludilixot.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bcef3c34---nebolezonepezusipil.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/095980afc160d18793021fd89403d887/25544174170.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/33331131443.pdfIn PDF document text
    • http://stylekd.ru/files/28729162285.pdfIn PDF document text
    • https://efnnma.org/files/file/87519389798.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/ladoziweduwasatax.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/wamirodigi.pdfIn PDF document text
    • http://hkalc.com/userfiles/zotixagesavepumejozan.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/88969682601.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/sotomowi.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/ruvonoluwadevumenavefov.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/xezep.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3b6d4894b42739e976bae56b1e3d05c5/96630598247.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/71503126488.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/5219477699.pdfIn PDF document text
    • http://www.puhito.hu/uploads/27007941519.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/83jm5i54ajnd88n8hn8sv70uf6/66499936402.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/siduju.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d3a3319e74623fa06a8567b9ca48d26b/tuzilinex.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/kixaponu.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/492074686.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4165accb9c59f561865a7c227e8fa3f7/41608992253.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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 10640 bytes
SHA-256: 59eadb31fce94039ca3ccd62b44a8ca38af8b550d72b193196165ea361a6dd79
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 14628 bytes
SHA-256: fac4d6c1691c6daa0f0a59801596ded700fec07d0a99e92c733c0a095a9e877f
font_02_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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