Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9d83491a57decf…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85fc1d24348364d07dc2e6a969bad965 SHA-1: 6f707c4f35bfb3041a9cd3f98965f6f9caf0ff6e SHA-256: dc9d83491a57decfd7f6260080a5a1a88bfb2ab8b7f109d9768bed465ac77313
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and redirects users to multiple URLs hosted on compromised CMS upload directories, likely to download further malicious content. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 71 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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gt13c1t76m88881e43j1tj04a8/zowuleborufurabugu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7956a23c6---63735847495.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d156f92c5018901b3e16ab9676e4a5d8/vidigokevuvelepa.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/13996958171.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/53436524822.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbf5926b---70330839094.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160982c09a10b5---69336179213.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/58268662260.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/87204579425.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/52010833107.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nenijatozatog.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ace8086fe69ca48e98885356f18cd56e/lunureriwiwafobetagaxu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c395b52e2e3---94021976918.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/18529470246.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd22634e8---45203479928.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/desuwitimekuxesexu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/56474497334.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48698bf9d---rekodew.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/guzitikazupupozasipe.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/mekuzafujoban.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vijoxojebope.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e11b762be---vulexolalaf.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2d58edb5ad7ce6c5d561d7d36557e486/witetawipejapinobap.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/768894626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=home+made+mince+piesPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 14180 bytes
SHA-256: 8e541e82589940e9e1383a1123d3f92ea3cdc22e9ec17d6e92659a69e48b4af0
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 10420 bytes
SHA-256: 0b13adcfb7ba547d8e0bf3f1d6a8a447039ecb671d0be6cc5aa6576363402f71
font_02_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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