Malicious PDF — malware analysis report

Static analysis result for SHA-256 70826f5c260ebfb3…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 16:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9badf926ca59559d64422720a3839c4a SHA-1: 66946be03d98472fd87164680f1cdb180d0c76aa SHA-256: 70826f5c260ebfb3e17bf61c112c783ca0b9ab5d4008289afee73efc232fb31e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=how+to+make+blue+violet PDF link annotation
    • http://konferencii.org/js/ckfinder/userfiles/files/24667077164.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/up9t0fn2q3prnujilc6mtil1l7/23312326424.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/dojijumitovemamefadurowe.pdfIn PDF document text
    • http://malifer.hu/upload/file/70292993622.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/jomevifatulajefojofojeji.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/29791039762.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/47045494758.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/55470888313.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/fijofon.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/jufotagulojirili.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16135961863ca5---tumevadafutusa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jilesujo.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dutizaxet.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/razegobuzorawafejivexadu.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/zevegekemus.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/568f44b60fbfdab236b085da46eab79c/jamijabepezogujedubo.pdfIn PDF document text
    • http://maksimetall.ru/files/81392218328.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/kiwogixeguwotefoka.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6a363715aa3fb5434dca38d2978ec018/vawaripovafozominuwajom.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bumavigitodefobimilonu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dokirularazesajinabi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/nirasuvikujodu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/66022367083.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/wudobexokaxomuzoxodijajew.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kemewos.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/93471851036.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lozofubulizuw.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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 18752 bytes
SHA-256: ce0f2c06c2ca8b61adbaac2721e62499969bbff2ee0a852957b03132c05c7a65
font_01_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 10372 bytes
SHA-256: 6918bcf8f67048858455c285675752a253984733e8c2b7ece945bbefec2c8ebd
font_02_sfnt_off00013a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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