Malicious PDF — malware analysis report

Static analysis result for SHA-256 5137adf79a715e97…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 06:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f2209ce615786f75fba44d5a75a79a3 SHA-1: 8e2c6753688774fdb42c400e7a8ddcc30b782dae SHA-256: 5137adf79a715e97dcf2c31218f21cda438bb6918a0f5ea51c2fe370318443b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and link farms on disposable hosting are key indicators of this malicious activity.

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://webminmax.com/userfiles/file/zugufakenufexeretuveno.pdf In PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/94434767017.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284866a920---lisirelazenetonil.pdfIn PDF document text
    • https://adium.ru/userfiles/file/28081728052.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/xemokobepemomusotirez.pdfIn PDF document text
    • http://espokebar.com/uploads/files/61074942074.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392a1cae4f7---jemixupuresilapu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gunagewinaba.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/kaxowogitubabuza.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57718086867.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/96960168689.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xagilizaxunimujagu.pdfIn PDF document text
    • http://w-mill.jp/images/file/7208133694.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/xakerevokalepez.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/49237225036.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/8496995459.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210916091136.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ec7ee9b1ef2029486ec768dfaef1fe94/25269561761.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f137bd383e---lelaxiwikigujitegususa.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/25078275060.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/41966324152.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/77029807984.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/xodofixalokiponafot.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/lidur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=install+misfit+mods+on+firestickPDF 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 10680 bytes
SHA-256: a447aab453b62b7759fffac4fb791eef635cccfcbbf21d2387e6fe33e7307248
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 18228 bytes
SHA-256: 9090fb23df4a3e2b60d8ca190335dd4b34bad0be7c46b3f7b88fd8871315ea4a
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1