Malicious PDF — malware analysis report

Static analysis result for SHA-256 595ad0c4abdd34cf…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 23:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ead89dc7e5e6edf8f19fd2cb71447011 SHA-1: ae155b66a074e7f3effaf4205de149c3f502286c SHA-256: 595ad0c4abdd34cf8c839764cfb99dc5a99d9be72c1e287bf49987f75610c080
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/86cf77c93e23701c463a81c636cfbc28/54724094280.pdf In PDF document text
    • http://industrialdevices.in/uploads/50265648842.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2ac73efd---xafojul.pdfIn PDF document text
    • https://media-get.com/userfiles/files/413275896.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa89f311f7---nekobezevamorovelivew.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/libake.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f98f5ce133---volokiwobez.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/74a8e94399b107ac2a272d3a3d26cab2/wijidaginubonamapul.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5ba3c2b7ef701927d0fdfd7d29578f2c/ginozuzos.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/086358cb7319b5b2b7b6d4d6d7a9437d/90705128776.pdfIn PDF document text
    • http://haphadoor.com/upload/files/65642727168.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f7a51c770b48909b8bc1fb6b40a5bf1b/pomaxivexiziliwutup.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc585653e0---vigadotekepemoguba.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ff6ffcbc706cc6f05fa98f326e309558/26612136929.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ed7b39a3---gofat.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/kakowulomemixawezekoxevi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xisek.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9443500ae7b61b0f37604772a91366ef/72431876459.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/tabunetejiginuzew.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7322127da---kixefogirateparubum.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/vezutig.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/8652831369.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/79f7da674326a4577c2c75a14f33ea9b/jovupawomakuviwi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/nepiduvufixaxibetojowerok.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/81590571670.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/75374335708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=high+bp+and+palpitationsPDF 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_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 10568 bytes
SHA-256: 77f91124f9e83dc22e0f4f19a7f27555bc812809bd1187123e36657b435bf66e
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 17248 bytes
SHA-256: f562af331bee3c00593b9848ac9d2f2742e2a56218be6ba31b35337fea4af64a