Malicious PDF — malware analysis report

Static analysis result for SHA-256 f175309f3ead3a20…

MALICIOUS

PDF

92.1 KB Created: 2021-07-31 19:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a79eaa6fadba2ec3ad902b9615a156a SHA-1: 7b215176d6c8d50294b54232b65d05a33582326b SHA-256: f175309f3ead3a2042dcc05b1e4ea5c1170c4a300923deee7981878a05fa49ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs pointing to compromised websites, suggesting it's designed to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=jurassic+park+operation+genesis+pc+free+download+full+game PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/673b6c92f45f8669da882ff36388d37a/fetapubazudizogexib.pdfIn PDF document text
    • https://dintek.eu/uploads/file/9943218223.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/ropetivulifunaze.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/71502425383.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/sotisux.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/saseli.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647b4e7e2f---72471054314.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/57694698533.pdfIn PDF document text
    • http://adria-ex.com/zipubukafewifolidebokop.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a98daa68---luzazugo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r602h0g217g53s1drrmikjdju0/nuxoja.pdfIn PDF document text
    • https://service-panev.com/userfiles/sariwepove.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073202526137---41415322827.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79887456013.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088273ec2dae---xavilugekokima.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072edb695f9d---49175322222.pdfIn PDF document text
    • http://etre-belle.su/images/file/12392022195.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/53474513222.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e1994c555---veletebavekilamugixizob.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/39010821081.pdfIn PDF document text
    • https://doitoutdoorz.com/file/osWhVA9a9O94Nc6Z.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161011019bf24c---duginadowuwokeliposuwa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/16f87529bc40e017dc489b9e6ba50b16/zixoroberedamelowob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 17192 bytes
SHA-256: 27e2e6e8b20d6334dc95c7505563e09f8c33cec324cdf624b3c7cd2140c4ab8e
font_01_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 11232 bytes
SHA-256: c03d7ac3146e7cf277e86bc6303af8094d8a29553fb6ad5ff37c91e3ff4afd90
font_02_sfnt_off00014ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1