Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c6544e87a91594…

MALICIOUS

PDF

89.8 KB Created: 2021-08-14 17:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d70f68362dc35e52053fd836623f444f SHA-1: 0e27e95d0e47b95000f94870aee00efa85360f2a SHA-256: 98c6544e87a91594f3a3dabf8a648e6fa5b99ffdc618c9c09ae8295d778423bb
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains. This behavior is consistent with phishing or malware distribution campaigns, where users are lured to malicious sites via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 http://azizolace.cz/images/file/kuxupifamotamatel.pdf In PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/ledirolesobogokosex.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/30521707783.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/nutikiv.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9fc09a3fbb87565080290aa46926ac86/rokekivimagewiburera.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ziburogibid.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cefe47e23---81566350317.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4cec30566a2221e511962ecd706192b4/90043184275.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/69231290901.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/85907286353.pdfIn PDF document text
    • https://mollis.rs//files/lewazedopew.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7cbd4fbe7691ba375281ae347ecd7f05/9188162786.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad403355d---kejuf.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16246321341432194305.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/54395368816.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4884b54ed897252c2215c65f3982cb65/49289496378.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22ef486ff---fofatuduzakosaginewix.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/darobef.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2ddff3b09efdc18cf717b34e55e15f18/tonabobu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ec173718---nafofatudegokisadinimupag.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b59a8c261c11e6832aefd17cea1f3955/80395515710.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tvkt95g05tvr1ob2o83i73f4d7/gumusikugiveledeguv.pdfIn PDF document text
    • http://centrons.com/uploaded/file/140882932260b302d0aae6c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=learn+tai+chi+at+home+in+100+daysPDF 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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10836 bytes
SHA-256: 890d1d978aaf5ba3c91c7ffe6d33c4ee2efc618276641716be8791df53670084
font_01_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 17372 bytes
SHA-256: 781b6661d6591b6018901c4a72a132fcd257ce634f3b5ccdf6c387ada4aef1f0
font_02_sfnt_off000140b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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