Malicious PDF — malware analysis report

Static analysis result for SHA-256 39af71a40b6a7a12…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 19:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 045a850a2414cade271b90fc12a7caca SHA-1: be56d3ac71b3b07e315ffa72d42d080ae5474747 SHA-256: 39af71a40b6a7a125bfde1a7b14c103a004de3e610c84784b0598cd7071b63fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The presence of a link farm and a lure related to 'gta v apk' suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=gta+v+apk+obb+offline PDF link annotation
    • http://studioassociatoemc.com/userfiles/files/53374422543.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/molikufise.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/13988878214.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/41507750570.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/tirurama.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/303c24cf560ae32e0531d467c1d18c75/22269807333.pdfIn PDF document text
    • https://capecoralliving.com/media/file/3133820524.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30200515982.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/69883688000.pdfIn PDF document text
    • https://majubesar.org/contents/files/zonorovimurilan.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/80453203459.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/33f532aca7a4f113e399e662bfdcce49/tebiviw.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2d31b6cb---21618831427.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/69211945989.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/33723960175.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mipubamiduz.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/98107327234.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/40928470913.pdfIn PDF document text
    • https://bagstyle.uz/images/file/70717959530.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/xezogo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/36147965204.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/vogososizipebag.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/valanufav.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_221617_165.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0f407dcc---67471780573.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 18284 bytes
SHA-256: 73fb95a84966055930da32e4547842f376d983bd620181d1320e2cddf2c5b90a
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 10420 bytes
SHA-256: e1de2b1a98e5b2b29b975470ff3b464732cb6f0081287312187e31fdca29524b

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