Malicious PDF — malware analysis report

Static analysis result for SHA-256 023150f6f64f4444…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 15:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3eb7f228ee93b1905fca45959ab53e33 SHA-1: 258003a334a91acee471d864fa2c6c87ca9efe98 SHA-256: 023150f6f64f44441f49701e228bf85c964e62dfd07d687c7a33efe6f314eeea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress uploads and disposable hosting. Multiple external URIs were extracted, suggesting a redirection to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=install+apps+on+sd+card+miui PDF link annotation
    • https://mai-avto.ru/upload_files/file/91756076548.pdfIn PDF document text
    • http://linker-apps.com/files/90040612861.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3965878189.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pipiwus.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee38bd8f18---88611640505.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/bugisutuj.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nalitobog.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/penurizav.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/gegamexerujugekurarale.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/73651645932.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210904173111.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210902112638.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/76588550962.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/49185450207.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/50204920486.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc548bef5f---ridufixamanuxisodego.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/tegokera.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/45b4bf15e989f24501a246f6996d7dea/71486431207.pdfIn PDF document text
    • http://anninh247.info/upload/files/bijajur.pdfIn PDF document text
    • https://10fci.org/userfiles/file/58651935036.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/89083398923.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92777596f---49017033351.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137381063ada---81205141689.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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 10596 bytes
SHA-256: cf220e11d271e969668c2a3e2fffb447a3305070058faca04e1b4ec79201b8ca
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 17964 bytes
SHA-256: 5c982dd605d3fce7457dfff09529d7508ea21e5eba514a99df2f2be7cf40efb8
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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