Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c7c783d26ad5b…

MALICIOUS

PDF

91.5 KB Created: 2021-11-13 11:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fa437b8863bdf4b3d69ff4b2096667c SHA-1: 3b5035aa598fcb9e1d861394145d0dfc57e85c71 SHA-256: 685c7c783d26ad5b80b7575da877f09d6f5e4983e00e7ef4d32ce7e2a0ed372f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/93082582792.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/26418801661.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/bomaki.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/35869654573.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/likinuluzumekis.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/lexiwamapanexewibada.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1617a2def4b233---zezamixobojuruladib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1f8116d7---vikujeximape.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/wezojifuzewapiv.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/liferizawipeni.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/5060126467.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb847afc4---zupimagizivo.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/74643249176.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20211031_633693ABDD2AFB74.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mivapimusidaku.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/pabavopisonexuxuw.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bapomusajoxudegovavu.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/29923189837.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/42671139917.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/49278654759.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109251532012720.pdfIn PDF document text
    • http://dsagco.com/Upload/file/44905600363.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/luvibutonukikagetazur.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fifes.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/33197240277.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/bagotefilafan.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16183dc5eb7904---kiwuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=lux+1500+programmable+thermostat+manualPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/64734347265.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_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 19520 bytes
SHA-256: 49aefcec01d1c3f24ac3dc863e77688e88088417d33a9e0e14ea43134719d9ed
font_02_sfnt_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 11212 bytes
SHA-256: 711556de0cc38e7cb9929b49a98e1fe7b7fd476b61597a876d70d53b0cf5d3a6

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