Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90fc6af3cfa0ac9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 07:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d81b61c15349e2f09f8381e3fbe2300 SHA-1: 5e6b3fd17470801c98db9c9eb5c7f1f2a9672193 SHA-256: e90fc6af3cfa0ac9261e39bf16d64af5d006692176069af889a61491af5bae00
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution lure. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=bollywood+movies+in+english+language+free+download PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/57lsnc3usdtm3vm12fjudqovr8/togopofarinopetulef.pdfIn PDF document text
    • https://recrut.com/files/files/55664145006.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dolobesotugotuture.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/14091888310.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/16331887640.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/24829575623.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/jumenanogemaxejedutug.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kofemaxuxurufune.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/82237408351.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_125153.pdfPDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d06dbc8d6f08be6b9742f6296cd1b7c4/majigekijeponesitujaker.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/38568643645.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/634ca998254f06d7aa4986d2613e4f85/luxatokasaka.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/92983997382.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sumipedukujo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/5443761814.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/worerap.pdfIn PDF document text
    • https://sharenkon.com/files/vojofujar.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/6416993832.pdfIn PDF document text
    • https://basisangka.com/contents/files/41641340901.pdfIn PDF document text
    • http://juentai.com/userfiles/files/45410583188.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3687291767.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/kowuvolesubunokinetabipem.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/17227151735.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137508eb61ab---kazisupunemiwafotexajep.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 11124 bytes
SHA-256: 3c4721ec6d2f05ede9488d64329e25f3d8505709bdc13f9de085dfa7349a5c3b
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 17744 bytes
SHA-256: 53bd12e1f0d8fc4b16f0fcb59629cc69b66f36408530bd0d8a091a6bfef0d424