Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fb34477e0f899c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-14 12:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56f41583650743be13a9efd1cc2d6421 SHA-1: 903de20963227aff742baac022bb2adee761357b SHA-256: e2fb34477e0f899c4b369393324ec4245a7436e34922b116d40e9a77eac99113
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one hosted on a compromised WordPress upload directory, suggesting an attempt to obscure the final destination and potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eternaseguros.net/files/files/kipabufevafotabe.pdf In PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/bunekokelixediwefet.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/voxenudobajasiwebenaxeri.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/mujexeles.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5846u00kv1h2ev81kks83gioh3/85159194583.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/jovitalidimiwun.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/bikutufurox.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/8460597007.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395adeeba49---nasojuwifiki.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vonavudaveromumujadofaf.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/37669854824.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/fukamupebe.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/13818676098.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/11590753553.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/xomejototutinutelum.pdfIn PDF document text
    • http://sun-tes.ru/files/file/begixud.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jozebedi.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/29202498237.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/lebuvavejezobun.pdfIn PDF document text
    • http://keitbg.com/images/files/5805985593.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/49306057693.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf29c6902---17094691523.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1a0b4f4d---999052329.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wupiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=logo+maker+app+mod+apkPDF 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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 16192 bytes
SHA-256: 46f5e82703063163ea31414a70090aaa836c9b5d67c4004b0b0d7755528e21a9
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10276 bytes
SHA-256: 89295063c829c67ac569a35640a0d5c27d5786263edc8bb442c165af089bfc89
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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