Malicious PDF — malware analysis report

Static analysis result for SHA-256 4359c41b74c15e6e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 09:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc7a565869b6a0afe10e5ad9c6f583de SHA-1: 506eb36c484e337b43e99cb4800283c2d3740a15 SHA-256: 4359c41b74c15e6eeb47ab36a5ecb6b8e17ac4101d0df17c97c4895aada57852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including one that appears to be a phishing lure related to 'free gems code'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=clash+of+clans+free+gems+code PDF link annotation
    • http://mawratanews.com/armedia/uploads/files/desajifuvinezonugadu.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/14779194387.pdfIn PDF document text
    • https://eetravel.net/file/59560164338.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/77183254900.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/94897715609.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/dawagumexuz.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/61255572391.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lisezukuku.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/bufuwotijopawanuwupe.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/xulipirumeduw.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091521291323.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nidomifowetazezaxowuge.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wuniwujetivaxazo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/11687406646.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/91143726790.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2ac51cee2467cf6d33429aa7034ed3f6/memejena.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/wodogolojoluzobafizote.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/girawuwunimipunidega.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/duxuvibawepezelovalobuvu.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/rogowepanodemaramobolowan.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e45308013---35306625313.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeb09745d---71144529284.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 10764 bytes
SHA-256: 0f3c18bde487d48931fa9fdb952b36822d2c6ca6094ea0b3d6905aa118b682fd
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 18620 bytes
SHA-256: e9dbc68946ee51400fb081db209599bc4762b595ca7a60342baaf1e5f45dee60
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1