Malicious PDF — malware analysis report

Static analysis result for SHA-256 a096c90c7ac341be…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 12:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 364606708ead185dec6676f34fc8e34f SHA-1: 5052177890db5a98ffa9d242147afec9e3b817fe SHA-256: a096c90c7ac341be02e0d326593e0298f009c022806b94acc13b2f80d0f59bab
164 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest it may attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cleangroupbd.com/ck/upload/files/tilamifuxiwudomakiral.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/lominiwonexebaredozafewe.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/45793533572.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/11297187402.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631510291.pdfIn PDF document text
    • http://salwex.hu/file/zobatevulomijesup.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/21876532413.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091204170615064.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kizudigafawerepexakidefe.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/wosowulasumuk.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/mudinaxulubavur.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/66730425213.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/051a68127e97fb242f79c952d30ffb62/19844426062.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/daputuzobimuzefixaxesina.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/17d52282fc52827d32dd8c659abadc43/letamabubekabab.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wuzagup.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_083648.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/99939264796.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/rinutafijogonuxupol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vobapi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ffa9a5b4c000eb6829d176889f498826/nifujalalu.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/35645735941.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/pitorelatadutipap.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+see+who+looks+at+instagram+profilePDF 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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 11228 bytes
SHA-256: 482bfb74e846d76d61bde959a957980c33e3a2d0222ea3901c0bafc6c30e66ed
font_02_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 18272 bytes
SHA-256: ddcc362d7caa4e5f5f2c71c416832a31bee8f374b8e043a5ad7405cf106ba618

Open this report in the interactive analyzer, or submit your own file for analysis.