Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a23d387f6bd305…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 22:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0826c7284e292fa6cd8058ee274f140 SHA-1: 1940321d847a23a3ab4952df793daa2a827962d5 SHA-256: 78a23d387f6bd3053014677720af3bc72a9d57fd26e7cc053c0ba395af469f1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or link-farming campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://globalquestconsulting.com/userfiles/files/7142336382.pdf
    • http://garagehayashi.com/js/upload/files/12124446071.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/ketupemonelopotenujuwoja.pdf
    • http://wsm.hk/images/uploadfiles/file/34313039718.pdf
    • https://laetitiabernard.fr/images/file/92053168351.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088152f39f66---lekeduroxoxijerotov.pdf
    • http://nemdanangpho.com/uploads/2021-06-23/images/files/69607514739.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tn109gfebht6anli8t3doe5jld/nodekomok.pdf
    • https://mbamantra.com/ci/userfiles/files/54274430485.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b2ee5b37---vesipamumekinomipe.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42a0a1e9---75822774008.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210616_091432_6018.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/mudexixibadirukavo.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3e7c80b8c15ab34dc70998bc13575410/moxifetofobax.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/u1fjbead7f0mhc4quh58aqj6p1/rapakozip.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/77a82a8e77ecb3b8dc43745bf7049c7e/gufakemadi.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380e388d3---rozaveserigarugif.pdf
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ef98dbaa7d63bac5d65f6c5eb03cf6ef/99387315540.pdf
    • http://dmkaudit.sk/101/upload/file/mogovobediveferatazera.pdf
    • https://doublehair.center/upload/ckfinder/files/morunut.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafcb0d68a---ziwarovew.pdf
    • http://consulcongress.it/uploads/assets/file/zufamogisilakix.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49caccda2---kojigowifubutalibexupil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=craniosacral+therapy+osteopathy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1c.bin
1c408a1bbd7e9f082250262c4a7b1f5838618f2d05266078e4f6b6db334428b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 10616 bytes
font_01_sfnt_off00010660.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 16792 bytes
font_02_sfnt_off00011e72.bin
65f6bd0cbc9082598be07b30689de81df6b6dbf3e37bcb2daf647a4bb69588fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16848 bytes