Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb0986e2a27edd4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 03:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9411e8059a73383f11a63144aff28c23 SHA-1: a5a0052e6ed3efbfeb0846f842531aa5b2fb5d41 SHA-256: 6bb0986e2a27edd48aa946a34832be0e998ec63f9211f2f32b8b666e81381029
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple external URIs are present, some hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=bar+chart+android+studio PDF link annotation
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/47565459339.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/tetife.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/26351862122.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/simizorewufarexim.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/dikuvavewinijoj.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/walajujom.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/nebajifena.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/xoditaj.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/daxojipadokimepe.pdfIn PDF document text
    • http://lagrupacio.cat/file/59125172434.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/punemimotopafizise.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/warurixipaled.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6j040b3n7udtohemqm7072s9ll/38937673184.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/13377434946.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a22b497f---guxavafefimedolab.pdfIn PDF document text
    • http://markone-tools.com/upload/files/20584592208.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wekogakajigunuzugitufug.pdfIn PDF document text
    • https://go2germany.ru/files/file/99765764373.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/74016907814.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139871dbf6bd---68686630651.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/gotuduzanakiziwoxowozaw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64422767984.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/94071589200.pdfIn PDF document text
    • https://digireg.se/upload/lexososuwaxubig.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_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 16884 bytes
SHA-256: 31e361b5840ec8a43104ed9fc8d874d551fa2555c9adb2388dba0df8895a62fa
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10444 bytes
SHA-256: 07e83a10942c2d9ee5dcae1e531fdc75e62bd33edc26dcc5029fd75770ab9c55
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1