Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e73e698bc67152…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 02:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eae9bf41d20c282a385f83973d7b0129 SHA-1: b7119821c5866eece0fefa6d496892526b3bff84 SHA-256: b5e73e698bc671521cfa72a637c739ce738c4961b57d03cc43628df035df07c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or utilize link farms. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document's structure and URL patterns suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=gta+vice+city+cheat+codes+app+download+for+android PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6ea6e2b46290388e96222689d80f07e2/sexefikoranoda.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/zoridafitedakanobo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a804bf328---golitodijiv.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b5bd711517745ae0050503d0b07e4d04/jitajafex.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/lezed.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/dawuvolesuxemilobo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090817161466.pdfIn PDF document text
    • http://ingore.cn/upload/files/kirokadavevarotutovurun.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/14857053722.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/78005504568.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p7se4glct5jbqidh9mpn4pn9di/ravov.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/37279508677.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d35b855---81814016073.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96439395952.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/81264216979.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/damojoge.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/91930035231.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/16336047281.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/53617044513.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/woxezazununajipixa.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912062240.pdfIn PDF document text
    • 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_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 17532 bytes
SHA-256: 64b8f496914ad74186d4fbbb85baafccc07844764fce3dc2071983a959d1f0a5
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 11024 bytes
SHA-256: f0d461f532291198e1f941ec2a84751acf6a594c9f951be5f7112d6db38adf5e

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