Malicious PDF — malware analysis report

Static analysis result for SHA-256 989e4e59510a7df3…

MALICIOUS

PDF

76.3 KB Created: 2021-06-28 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f387321c9f698cdd02659068c83184aa SHA-1: e74668d0f5147315f2bd39d6fa1fde7875b39e5e SHA-256: 989e4e59510a7df38bd1cc91a5ef3c11db6b109ee372082bd2acc8c87f7b6984
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it contains exploit code. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other domains, likely to host or redirect to further malicious content. The presence of malformed streams and a high ML score suggests exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf204173---baluze.pdf In PDF document text
    • http://caryhigh1987.com/clients/41333/File/162018546.pdfIn PDF document text
    • https://area5srl.it/file/danusugamuzuvupodavi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae8778ef8---pitowitemuzuvebid.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078e923843c7---fekaronatuzulomamed.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/26437566900.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/wivubofoju.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/96785474641.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/laxosefutibesepamevides.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/99228033542.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/95vluk651vtunbdotalfh927rs/wewelenadinorokex.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/58285774670.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/940ab6777b15e937cd80465839d8981f/26877154648.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ef7f4bf351cd691387b9eb74f2c80cb/vumetalalizozabojufa.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kimirixuzuxepexazozoz.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/somuwivuvigor.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///tugowedi.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/vufurufoniko.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/53359556790.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92f483fc---jivozajuzibotapodenafofi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ee109367eab9157652559e0ec7e055f/94674266148.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/129f8b3410f8d21f9e251d680931c444/27238368507.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a82f53aeda6ab5def6224204352ca4c4/20709745377.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f2p6m1ie5hmp9alsem9sahkvc0/xopapimenopovokekuxoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+train+a+dragon+3+streamingPDF 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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 10796 bytes
SHA-256: 49e7dffbf5f3c592153269aaf034e9ea6003d676c2ccbe21dbc8a3f35c74a744
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 17480 bytes
SHA-256: ea959490cb09782521e16dde12c37fd0bb405122f614a0b857989f1ecef3671e
font_02_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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