Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe85698392b9cf92…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 12:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d876e953f2753095aa390a4edd2f1fa SHA-1: 6a28f1f46a1d05db13d758876b1fdba8ef3202c5 SHA-256: fe85698392b9cf928c07ee7378ef58cd8200eac91a5243d01254853239512edf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Embedded JavaScript was also detected, which could be used to further exploit the user or facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://kalikraft.com/images/file/kesoz.pdf
    • https://simpangkanan.com/contents/files/57550203995.pdf
    • https://natyabio.com/uploadfiles/lasunerabodekovetaxuge.pdf
    • http://musikpark-live.de/userfiles/file/xiwomijesatu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136103f8dd27---87959949465.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/27388313241.pdf
    • http://kientrucphatloc.com/upload/files/putexaletuxoxiwifilez.pdf
    • http://dorrstrechy.cz/UserFiles/File/fededase.pdf
    • https://mollis.rs/files/72365133637.pdf
    • https://toptenstudy.com/upload/files/BodyFile__6144963FE9564.pdf
    • http://cermak-expo.cz/data/files/file/fewemobozikajafove.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292100bd93---karosezazon.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/60213677492.pdf
    • https://hlj-vibration.com/uploads/image/20210913/files/20210913135100.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/xitafutojugujimixoki.pdf
    • http://mayinmaunhat.com/upload/files/24401429723.pdf
    • https://manhremhoangvan.vn/wp-content/uploads/files/nebixukopak.pdf
    • http://allaboutdowney.com/userimages/37709939753.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb35c2049d---bewagal.pdf
    • http://technoauto.jp/js/upload/files/76441268090.pdf
    • http://kahsport.cz/userfiles/file/44066330572.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/12hfrj42l7blp9b7ni55pne0mo/sesapeboge.pdf
    • http://pedraferro.com/files/files/83464296745.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396b205315b---91030701665.pdf
    • https://nnt52.ru/userfiles/file/fuvusebefojotiva.pdf
    • http://chinalabware.es/d/files/jowegopasaxazunalifonunil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rick+stein+fish+pie+with+panko+breadcrumbs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
font_01_sfnt_off000106ca.bin
af2c405f3df654a99b9262d67bca5902067bc7b26b320b6441f79c45a6f7a278
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 11300 bytes
font_02_sfnt_off00012101.bin
ef6b7c73986334cef0937efe7a8f8267c83d91bdb2882b665de90230df80f9de
pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 18880 bytes