Malicious PDF — malware analysis report

Static analysis result for SHA-256 62adcaa64561429b…

MALICIOUS

PDF

98.6 KB Created: 2021-09-04 08:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c15d6e8a1371e744ec669744d46e1cb SHA-1: 3e42f814d2bebb659494351356fcc479ff94a09e SHA-256: 62adcaa64561429b96f4b84f5dbd4d7ab4fddd645e12ef4132676c9d0543e146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=surah+sajdah+pdf+read+online PDF link annotation
    • http://bygreenpure.com/userfiles/file/80418486714.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/tilesetako.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/kebejakalutamuxuwin.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/34980786073.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vipiweloxasabe.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24d0cc578---27697025052.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4f244d9bcc668e1d0c4338786cf79c45/zamopigaref.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/52ca7595ee67f963f8c1b118260096e1/47473548669.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/02bcaa4d12e99f8482b392ec3d894bc1/galegudotekil.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a15c71050c4d34f18ff2ae3a25911024/21277463852.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131416fb0adf---jobepol.pdfIn PDF document text
    • https://produse-zilan.ro/files/20031689712.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/xibexexukugodumopexi.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/madosi.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/lonozokepujebixubar.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/dubibu.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/nupegunakexevafimizuf.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79223592552.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18126077975.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s1cnfd3jfjpff6ns4dtct7tsa6/bikoxi.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d8e130859fb90a478ae0937cb9d540ba/15159900295.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7e63137e---77372831671.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefeb70b53---xonabagedofipoluw.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106012320038502268kzli6.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa425ae3---tenogetodatagofu.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/vewosojega.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_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 10800 bytes
SHA-256: f51de718b76a07292d74d8128899901175c86481f94e062a93f22e424404377b
font_01_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 21112 bytes
SHA-256: 2d38aa4b57145c1001bfa886faf11c844b924df354670e951752b2d081baf532
font_02_sfnt_off000164bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1