Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9786185bac2209…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3ac15eafcf9b1d884e0385cf1e10ec1 SHA-1: b0c9d6713699ac1d8c03802f2d94c0caae3b2bec SHA-256: fa9786185bac2209b9ec6660661c85ee236ec8b734d9882efc272d5feb085d25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://studiotecnicodavico.eu/userfiles/files/8776230498.pdf In PDF document text
    • https://clubon.top/uploads/files/mewilidazovikujasutapa.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tukodawigasetajosusakuna.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791e9c9ffa6---28459015138.pdfIn PDF document text
    • https://intersat.lv/files/file/melesemobuvinulujukirixig.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/92837779305.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92388583d---43166945499.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/93501461267.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/wawewu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/93812673585.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee99b03860---78161122075.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6d8ab4a1---sesupinedigekuzarojigun.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be339ad7666---45559434135.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/bebojesiwupetuneg.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/bupojofab.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/99689386671.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/82313215111.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/vibosolezawasatu.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/gomibadudezobidukimutix.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d136bd2293---wiwexekasatogaditil.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a98982ce08d---vagovonijotizatinaki.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c71cbe1738---22606224660.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/laxebadutosafijijeget.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210531002852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shading+tenths+and+hundredths+worksheetPDF 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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 18700 bytes
SHA-256: 8415c45a76d612f82f268a29931b4b572c41bc71e3b904528ce21fa3fdcbb942
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 10832 bytes
SHA-256: 31074666457f89eaaf21263c4060bbe3d925b30bdff69dd7963626002fac3b00

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