Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ecf141d0735276…

MALICIOUS

PDF

94.5 KB Created: 2021-08-15 08:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baf50d4885e903dadc1d7c363eafb860 SHA-1: 41182dc56ab7e8a06d4035f62e088e360a11e1f9 SHA-256: f4ecf141d073527672aa86e6f8f2620be00bd9ced711eeb0fca289709cf74e34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://inwebjor.ru/uplcv?utm_term=biografi+abu+al+qasim+abbas+ibn+firnas PDF link annotation
    • https://aprilboya.com/userfiles/file/94871539716.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d7d9223f---81642434782.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/mekorunirupuloruvifuwufik.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/30053678631.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/zodetogulo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8371ff744e0bdc6d1aab1e3fa2b36325/7085362489.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061822215331.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb0fdd977---71723375890.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210528161148060015lcvjsc.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pupizut.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/20638812685.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7c2bfaea---bidalimijokepirelerupaf.pdfIn PDF document text
    • http://zae.me/datafiles/file/fexadidodemedud.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2561ccc1---66673561859.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1o8seclgpib823ncbmtike4ol3/80448321304.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/zofajorinonexuwunipagit.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/30441952805.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4403fa0eb6053e5b18742525f234429c/roputogotow.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/56780516109.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210705015620450.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/vexezogufukanezixejer.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suvexinokowibugulofafojur.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cceb1034c1f---xixagipuroziked.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/89810710728.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f333.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF333 17016 bytes
SHA-256: 17a316cbecc31b3679346d1c4f23f1c7d71b40ebf285eb531c04bc76aa60ba5d
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 18352 bytes
SHA-256: f70ea13c56111d2f266670f8ed1488e280d7e610f872c5e52ae57c4ff23d0625
font_02_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 10768 bytes
SHA-256: 7033b2e3437f44a178974b006b08002509ce8cc0f534494287941cdb8ffa9399
font_03_sfnt_off00015299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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