Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9b709d8a800a2e…

MALICIOUS

PDF

102.5 KB Created: 2021-09-01 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b770026b9774284b58e661390b3b306 SHA-1: f8ce44755ac17a258c6a69512008f7cd3f8f1a1a SHA-256: 8f9b709d8a800a2e88ebb966172f34c5de3aff0268c47610f9d56c634c5acf4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the overall structure indicate an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thinkhigh-tech.com/d/files/72243858802.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9f68e45c8a984f1d459848c153099270/ludexukojazepazo.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zofaw.pdfIn PDF document text
    • http://altinay-law.com/images/file/logaxoparawojewavipedurer.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb30adc626---likopiwezarabevem.pdfIn PDF document text
    • http://rococosofa.com/files/files/kuwokirusebaf.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/rupuwamev.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/wuwipuxojitanunemezi.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/5386453337.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a2204451332c5963171cec3d5a5e8c0d/tewumofediwopuduxobaloson.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b34c4e33---99742163617.pdfIn PDF document text
    • https://edarky.net/data/file/birizuxeruroxederozijivom.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/12367156385.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/radatatufuvapi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608251f02ed88---64056949882.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100ad62e934c---66320050843.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/98588833102.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/46219108764.pdfIn PDF document text
    • http://hk-keber.de/images/file/febugarugijuxebiso.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/31500689988.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ketajiziriz.pdfIn PDF document text
    • http://cycling-software.com/files/file/memikamajirutegudotoga.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4c20482e---tuwexozozutibaxukirumev.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d55e135630---selewowakegepetivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=issues+in+financial+accounting+henderson+pdfPDF 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_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 10948 bytes
SHA-256: 6e2bdcc3e6a8502c209f6d2c714b7157600b3d5c6badeff2b98e798d1ae04804
font_02_sfnt_off000159f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F9 19124 bytes
SHA-256: 9a9f2037717728ff9bfef484a9c71c4e3ebf5a48204a1308de57613e1e24ba67

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