Malicious PDF — malware analysis report

Static analysis result for SHA-256 022a5e9680b5feba…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 17:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97c14f47f94f39b5374e32154a0622a5 SHA-1: f266f260646e8c3fc94d786ed4ceb74797d94658 SHA-256: 022a5e9680b5feba7d44d0e5de4543f6fa713296ab0e05f8581a0dc775d3f5b0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c781b9b392a---65054306948.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1815e9cf---77629000710.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/13269490319.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f61007ab38108f34ea18e6f05e849d5b/73060872989.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tivusul.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/50302621123.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/14113538923.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df6904d7272---56954516503.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092b30a47d83---96071311214.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/mozup.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/19091481792.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5ef9982be2def8ed8cbc29f5753f05ea/zinifalisuwenebujexigo.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f372f93cdc14d25cc932ba576290362a/vakuze.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fuzurelanoram.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/xifafewekikudidedif.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/30953433248.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/99659970421.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/55960245484.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/nekobirowolajejo.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/35587321252.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/40720895468.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/tupew.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc9707e52---14090611571.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/timunegebesiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=asap+methodology+in+sap+pdfPDF 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_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 10940 bytes
SHA-256: a6aedfa86326a339f58e3ecf6db802ed8a164d51db7354b9ef987652ce6ba673
font_02_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 15996 bytes
SHA-256: db4f87fc11df47e815e41bd1004c6df5053ad33828c682a51dbdb141f85dd3af