Malicious PDF — malware analysis report

Static analysis result for SHA-256 9813e6b326f93525…

MALICIOUS

PDF

77.1 KB Created: 2021-06-28 00:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3fa92531ae7cd82046ddaec4e57c685 SHA-1: d9bbc00432ed876b02258a4325825fb3b960f742 SHA-256: 9813e6b326f93525e80247d1aca1d45ecb319a55d85867dd4349df848ee96070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting it's part of a link farm. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87971b2b0---47285994207.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/amn08msk4h7jpmu97rmtte3ak4/75912964172.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0042cde4---pitozu.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f41a762a4---zefubonutimaravabebojuti.pdf
    • https://advantagelic.com/singhania/downloads/file/tasovukitadulivej.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/29169331641.pdf
    • http://kiavysocina.cz/UserFiles/File/loxamujamuzukavifolize.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092973ee1d60---70498470179.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fab86dff---45397666695.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add397874d1---nuzudemodafopexug.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d0f8ce544d5a3580e634a7b4914d1155/41488666261.pdf
    • http://qkmedica.com/uploads/userfiles/file/79604159686.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ca438e09---16831228427.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7a699336---xawamijujijixevexo.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada832b3d26---4512599693.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/vejiv.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ad206239---nudin.pdf
    • https://kermoulin.com/userfiles/file/xovinovewasaluluxu.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/49074462395.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093963ce1d1c---rivokikolepasogewariveku.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e32d2af57---27347859352.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607017600825f---82643306856.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jr3rl94f2lvir1pvnq50qdip5n/wepekoremojoloxizovel.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fec9d0826083cc51624d5679565c0d5d/lekexodepi.pdf
    • http://elsekmont.eu/userfiles/file/89697496169.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kidifapixekumibilige.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=basic+engineering+circuit+analysis+9th+edition+solutions+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca8.bin
76686a6048483e8d44cc86c0c5cedcadcc894bc103900640cd9badaaaecfa8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 15060 bytes
font_01_sfnt_off0000f38e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
font_02_sfnt_off00010ba5.bin
6a5743497e4b0db9f32a87b7b4faa7a6942c5648f44ae04b58508d70e48d233d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 11420 bytes

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