Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd9c136a242719…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 06:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 6fea0d7e783d2c1787ec7c5dd624fa4e SHA-1: d1680c5f2490f806e4fe10e5ddec500d04ddc3f6 SHA-256: 25fd9c136a242719459d7e24ae543006ae7b9b53750421c891881708d2c9c3cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of external URIs and a link farm on disposable hosting strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tlxzkj.com/uploads/file/232323011656.pdf In PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/38316120011.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/44597251711.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/akrhlr2rb8imgtplp13aon0er6/puximu.pdfIn PDF document text
    • https://successalpha.team/upload/files/ginugagi.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/xikunem.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50198698540.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/bitasamatasilafoxaxuk.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/82112491398.pdfIn PDF document text
    • http://ingore.cn/upload/files/45198045038.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d17beae92c---81572119794.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/61125328856.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/kedajinugut.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/88406088950.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a0abaf3---25651979597.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/nekutekunofixavum.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fakavajozufaximid.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mukikinas.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wawevudegalivo.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/92556988003.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/gosuxawi.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/ruwexewomejatutevefutuv.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/70838260778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=justin+bieber+feat+ludacrisPDF 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10580 bytes
SHA-256: 276a893cbae9768aebc97f13fc17bdbf2217623212323d9c79521fd45298ad69
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 19904 bytes
SHA-256: 0b269e7928208d2b2d9de34b02dd9322273c9355ff47d33605aebcee33eaac56
font_02_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1