Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9dabfe454a9968…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 12:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d0a3371fe167ef0264e9670551faa41 SHA-1: 243d9a31bc024e1d726aaaa06010b51a628ce53b SHA-256: 1f9dabfe454a996888143ee39d8ce0047eb6495854fed69b12225221fef985ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://autosoftware.company/autoresponders_images/files/rupopogigibifajufaketus.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/19eram22tl3e6lrjjdbhe43r4a/fopuxujatewug.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq84nve0mt8ohopb5qep6fbg6n/95008560776.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/tazapo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6d946e370a1e0862dc4497ceac2bae6a/7920435007.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/51106683916.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907000513.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/daserufebinerova.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/49789602293.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/gisivumupofobamepes.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/turoseninumunorivinak.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/reloxeretipoju.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b01b9bfaa---47668145477.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/69930678561.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/52966824646.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/sijub.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109151245008586.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/8255742015.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136656ddb5e3---12618366943.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/85230783368.pdfIn PDF document text
    • http://innotack.com/userfiles/file/37420688487.pdfIn PDF document text
    • https://khanikango.in/file/26622039862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=i+fine+thank+you+love+you+watch+onlinePDF link annotation
    • 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_off0000ad9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 10576 bytes
SHA-256: 547d5074010833075245b934a271b379c1d696809e58c4b246440bad78b670ee
font_01_sfnt_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 14268 bytes
SHA-256: ea4cfe536c3aa31e0e86fab06678bfd63e20b4967e6c6d7f4c37964b8cd26a25
font_02_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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