Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e25a2a291ceb09…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 17:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3d68dac908497df9ab983c62bbebdecd SHA-1: 30cd8095a5fe5ef42f8ea438dc102a2537ea43ad SHA-256: f9e25a2a291ceb098d333c0fe84665e4e7d188d4225c47cbbc72675e3800b4d6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and potentially disposable hosting. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9145df1c926180dbdf02e8eb0580f24b/wolozatow.pdf In PDF document text
    • https://emauto.lv/index/images/up/file/didakisiwuzuludored.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/lokilaxoxawobixap.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/16c5a5ffffb09fffde04d4a9fc706d41/16622803809.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/899ed4fb659d4e602688865fe2ee03e2/83359120134.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/lelagexupitofijo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/lukapokur.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/41128602252.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f39219fb---42657011839.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/45082827308.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/luburofunapatavasinav.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/96657621445.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61223c9a9---34960405351.pdfIn PDF document text
    • http://fittbike.hu/files/file/zajamaber.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/lisobo.pdfIn PDF document text
    • https://bliznacite.com/files/tujigopumijanezewazazanim.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160833e15a8257---88204093447.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/28235957435.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dbkq8h23gba8qo8924as3pi914/pabavonapisodiz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ea21fbd4afa827744347ade45551673f/tadup.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/91618331541.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/leronulabudexof.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04727889d6---9071897449.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38127b92ab---54541424120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=billionaire+romance+books+to+read+online+for+freePDF 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10924 bytes
SHA-256: 074cac45755525bcfe3eae8260988151d834bbdee79802d69b8fcce81b87e808
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16748 bytes
SHA-256: 2070ccb801a3b8d55c2d61b0f50a775f6d222a8bad2177389d91764d4c33114c

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