Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc5cfcae6158e82…

MALICIOUS

PDF

85.8 KB Created: 2021-07-10 02:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 075f4650c94319489342a0e4e2299873 SHA-1: 8736fab0cba63d95e1776127c7614eb1eeeddcd2 SHA-256: 7cc5cfcae6158e829bedb4a64ec1aafe638caa0471e6686f571537a4bc37d910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised websites and disposable hosting, likely intended to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cornerstonelaw.eu/userfiles//file/zixubazobitenuraf.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f2d0ee20---4795061442.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/86236260455.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/55410341126.pdfIn PDF document text
    • http://elise.pe/images/file/zupuxu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/59766175f0a33e0793f94fabf6a062a9/44883185983.pdfIn PDF document text
    • http://sakem.org/userfiles/files/89437298628.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608016586b73f---megowapomodifinoviw.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/waxebogurepetupigawaxizin.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2d16ae91---93500439342.pdfIn PDF document text
    • http://gyobel.itpublic/file/87438255928.pdfIn PDF document text
    • http://bamila.vn/luutru/files/22546935987.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/bdcae55c5c83fa1321a21a02c7b35f13/25821408612.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7de1499c7ac89a92d098dcc53baa39bd/80218791025.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rf6v6do76rnvc55qa36bgsjmt7/74796707372.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/97454919556.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c00e1faa931de04851a5a95e75aa726b/81118093895.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f570a165---talidajopomudo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ef41612f2b90e355643276ac0e6c2cc7/32595214852.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/13920541034.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/xagadedarofavevuteme.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f128976d6a---vonibenaberedirije.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a145f6f23e788c98d1e6731ba62d5c2/23383703500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+chinese+fairy+talePDF 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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 10408 bytes
SHA-256: dafbd7c924e7a63eae27547836ca038079668e19f2c6f1e07a1cc3969c4e5d4f
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16084 bytes
SHA-256: a379f706b9e9d284a4f38be9db7650715cf02df1dd913038e9619e7058004656
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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