Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfaf40bb53d87d9…

MALICIOUS

PDF

85.5 KB Created: 2021-08-09 13:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d67ef41c0cafdc85546ae4b51eb5f1d0 SHA-1: d9c22de4000d6ca363a5a4f5dacd33738175ba29 SHA-256: ecfaf40bb53d87d97a2095488a3ce8b86c6139ec8082a2a786c8a95da98e5168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hasekei.jp/userfiles/file/mekabupokinegami.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jhf31bcvigh35k4nrkl6dd070c/jesifufuzefuj.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077779c23c07---xapukof.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161072157282eb---gedufodawuveletezejupased.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be642e31912---xinimipaxujutem.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hnr4vm3h88d60gonf2hm91va10/89319724537.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/jamixodofetaxoxizefuw.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zodot.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081835a2ea77---rosefa.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021621132548.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/poduzubenojaveloparumij.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815d78ae15a---99364313025.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/30302320158.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/79258970427.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210620032010.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6e27210a55c498a33d51f5ab77f28655/zelanutugi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077500c02a5a---lerutimu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee59af2e8---30938450109.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/wevolikerizuwesisajabop.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kagamowubakusu.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/60396800648.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/56721885307.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/51159406488.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/01b36ead04ec8774bdfcc7e812614c92/kudoxagizadejavan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=electricity+and+magnetism+unit+test+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10968 bytes
SHA-256: 38eb18c836c7f49b8a4c4ae19e459fccccb9eadf9d048c8f544df98a481d7b98
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 3968 bytes
SHA-256: c5f427906991f3218e4a602c4c6db783901f03f0fa3374875be5cf0bc6ee007e
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 17020 bytes
SHA-256: d2e4ea6260d5b46245236b0f9eb68b489bca3d3544703e6755195a20b9115a28
font_03_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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