Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae71f5a09e885af2…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 02:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29e626214064f88ab6d9151f81b60d05 SHA-1: 5290c36819150a6b32d2a3b69ae5d2701adf4f9a SHA-256: ae71f5a09e885af2b534ea46b9295bdd2f68196ebf92b83231960d6978f4b858
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common phishing or malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=fortnite+mobile+download+play+store PDF link annotation
    • http://uteambio.com/upload/files/36061368273.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/4117220382.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631955870HVpR.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/50444376985.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/37547098907.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fc37efa---dimarex.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/65250202538.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/74444198083.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e30943f3a---kidululewutagoguwigep.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/16187918628.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/wugexubababagatabibegima.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cdbd8f7eaa54353210dd47c15a9e6021/vasalikebozasugu.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/zugagukuzugilagoru.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/runomobupaturepikexor.pdfIn PDF document text
    • http://telecycling.info/files/file/30399814899.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/momumusoduti.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210921150052.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/77956613264.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109040346425602.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/zevumibaku.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035c38cd3a---65159754554.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/eaad1f22779f8aad777b16eb54f553d3/jojutozifiles.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xoxinaduxoxipuzolitute.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_off0000b0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 10872 bytes
SHA-256: 82128080d2ae0cc90ac29b935b99aea7a06cedd94479c682ab4df257aeda5889
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 17520 bytes
SHA-256: e4a74f22ea5804442e4824802de52b905beadf26b38c30c1733ad1b5916a7c2b
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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