Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e897316406e1bf…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 06:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73a8369d9439c45e145e5c6098a09b84 SHA-1: 54c1799f722505f3dbeb5a36a776cf0067cac54b SHA-256: 46e897316406e1bfe4a0b46b67d024f6a76bf3006a93d19e6ce72d7c9bd7f672
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are compromised WordPress sites, and others appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. The presence of a 'download button' heuristic further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zrdb-drogbud.pl/Upload/file/juzazolerop.pdf In PDF document text
    • http://actybrain-consult.com/Upload/files/85457469566.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/99272730137.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/sudugawolisifoku.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613929d44110e---80954105366.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0316b2c7e2fe07a3bdb0a2854a991cce/gefidonozipefa.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/72768522698.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/52810182045.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/53140781435.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/36252216711.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vafivinok.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/12235294638.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/2651802054.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/65760098238.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e048b7a28b025ba892bfbdccfd97c03c/tadali.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2b0ed2c3---rukegidemiradunojaluke.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wunugubaguzegoza.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/46084107356.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb58805fa---rifukum.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46044337709.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/wetuduzumemipokupuvivub.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/pawixovufasoluxulixapago.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/64283471746.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/supuvubakamuvinex.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lirevetivajuja.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/9534180780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+1+subway+surfers+hackPDF 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_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 17708 bytes
SHA-256: 6f55c0b300d0983bdcdfa41635c4fd875c2dac426fcd902b6eed4fa326a179fb
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 10996 bytes
SHA-256: e58ee934cb5519ca4826505006d1d3be43c5195142a08e9eeb344b5f2427f7d1
font_02_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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