Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9439ed4489214a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 14:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad3c7d79f2772dfbc55d89228df8df8c SHA-1: e687903d241fc4cfc520f487faec500826f62524 SHA-256: df9439ed4489214ad56ba33af1cde1ae2590e2eeed18d6323ebaf27f8e6866a2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with a clickable action to redirect users to external URLs. The embedded JavaScript stream and the numerous external URIs, many hosted on compromised CMS uploads, strongly suggest an intent to deliver a malicious payload or phish for credentials. The ClamAV detection and ML classifier further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=minecraft+newest+apk PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba96a594d---58822687173.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/bonanonogibis.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/daguribaxof.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/26846299038.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/buninobutazokeni.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/25887734735.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/60842812990.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/28179761685.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xawozapezimovebamumali.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139518453c5b---48685831524.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/23993511610.pdfIn PDF document text
    • http://twilaw.com/files/files/68860120280.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01550a4874869baa4ff2e40ea17eada4/73761794758.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/50972100386.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/64727295127.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/54449950604.pdfIn PDF document text
    • http://npas.ru/pic/file/52565385614.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d31b8d431---savulelalitisasop.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16792776485.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wozasaz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2d99a87802fb0d974466100d0ae7508/38949545412.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/60284621061338af4659c0.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/653487634cd569d431e6f1fe8ab6193f/bunuj.pdfIn PDF document text
    • http://enewind.com/pliki/file/dugumubutejeko.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_off0000b05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05F 10476 bytes
SHA-256: 2585540e2927909fe39aff1fee69d284c7e0654a7a47418e23955eaa3a92e5fc
font_01_sfnt_off0000c867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 14204 bytes
SHA-256: ced98d5e00c3646575ce0d3865b12a84b531f36737fbf76c6cc8217032ed98dd

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