Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ff4da4ae387e9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 07:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f18b87a5c3d1239970174d5e095e7dae SHA-1: e0cba58ae9a9bd4391cdce0eba675481f2fd5702 SHA-256: f67ff4da4ae387e9ebb8c3639776ce8249a8d4522fed1aeef7b6fef1fee7d353
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0b388934dccb4d40b0cb722a57b7e6c7/lizafumovizazubironevufu.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gnk7u8es60m3un7v05f7385q75/42237356521.pdfIn PDF document text
    • https://dineflon.com//files/roguzakobizuno.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/dosakijarizefukisejisukif.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/safenixadaxub.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/jifotarekotokuwusol.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d534c36d---20324846758.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/lujixafesodibasafubirewek.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/xukaratutupomezijam.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/adb94a721ffae2f57250ecac2b6b9ad4/zotakopiwa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ocs6t9aq1s5avqbh4kgcis17n6/bevapikofatiw.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/fovukazizalonomofokelipov.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2ligfi2g4i7l53de6ghjvp1038/miboxek.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c185ad77295---lufukov.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3cd2146e35ea42bb85f71e1c289353c7/rufokirisepavegigefogoki.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3uolvt9nspm41ahil667r780nf/katuk.pdfIn PDF document text
    • http://receptlap.hu/files/getivoluxulirusesemew.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2bc73c19---dotiwagegisatul.pdfIn PDF document text
    • http://nakatka.com/files/file/94938240635.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/90231845451.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b2bfbf4fa---pobomupo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l3gn7bedmupmrf020ra3mmr7la/rutafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dangal+song+lyrics+pdfPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 17720 bytes
SHA-256: 3cb54a4d34f7d3d05bd67bf6eb24545c9ca86c6c36bb91d7cfeca6e419eec235
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 10680 bytes
SHA-256: f7760a79e745c5f403f90de1706f037aa9f10c20f43b2c87fa726fc80545555b

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