Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7aa7b9891440199…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b32d1d025eb0cae458d46f341da61e SHA-1: 703bfc9c7600f1f98ea4e31f2605e562a8f3c0d3 SHA-256: d7aa7b9891440199f99c337340f83c5bc401fbb526c9400ca632a080ebe9b67b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cructi.ru/uplcv?utm_term=pair+work+activities+in+english+pdf PDF link annotation
    • http://albino-pitti.com/pub_img/file/2043066369.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/junarekimati.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/jivoveraxaxalarito.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/54296110018.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbaadbd15---nenurosazixuk.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/61287158004.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/51de3b81d657c92ff031289457946c28/xirutuserina.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kojuxisijuvaxapurim.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vafomumaxafawumu.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/xeneporediga.pdfIn PDF document text
    • https://506hlapeta.com/files/file/befafoxom.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sdc4krg2c9r7d5tsvna0fh6jjv/24335521545.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/26585220156.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/55659196362.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9f60d1cc---dasubasalaza.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/49564262488.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/13957123428.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/tezorilaxezupijofawupuse.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/97630495241.pdfIn PDF document text
    • http://4bx.pl/public/file/vutuvegupela.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079decc1ef7e---vesatuvigubag.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4bc5cac843f9f44d87784005c3714bbc/6162580810.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/53412486101.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/16784548291.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/kefemoke.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/tujijipa.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 11144 bytes
SHA-256: 672552e6beee86d2c9911e8055f4c748930f163cd1059ced25a9f24580e35596
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 19316 bytes
SHA-256: 3b0dee0b722ae387faf41a44500fea41a181d4228d11eeea094c3efac7e39b6a

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