Malicious PDF — malware analysis report

Static analysis result for SHA-256 031d1ac93f1b4150…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 15:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6efbe815d2fdc563c64734a47df5668 SHA-1: 5dd171bbdfc8913ba118eb821c11b1a52a8c965a SHA-256: 031d1ac93f1b415032b829433670021f7969f5588be0bfb6ed14da9badd183a7
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further support this, indicating the document's purpose is to leverage these sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/33ad9f7413120226fe9cb1d3107de5ce/70950017505.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab1583e3a---32882465901.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/gufibufigakobokamebovu.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/nojonek.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pegamofuvekuvixosevev.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/volumenavuvuredukenenij.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608073a5218f7---gizilefavokes.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wowivezagoxufuga.pdfIn PDF document text
    • http://446888.top/userfiles/file/mukogogaxatiguf.pdfIn PDF document text
    • http://axwelindia.com/uploads/42526560613.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce0c3a8b9---46958723286.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb9abb6837---2034078870.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/gixexama.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110aeb6c6eb2---59020685332.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/69166770607.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5sh7b1tje4m5ffmdvml5hvr9jl/87443016267.pdfIn PDF document text
    • https://biocoils.com/img/file/jefozanobate.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ce9fe5ebdb7792298752a1bc905df89c/88765077965.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dc94b065d9d7548085db377839f74f06/negiligozerired.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab649ef6a---vimesufoga.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960545002---makanonofuten.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kavutesovanexef.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/23513805195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cours+droit+civil+1ere+ann%C3%A9e+pdfPDF 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 11016 bytes
SHA-256: 688a791f265736a7dafe97b769c2f8158efaaa20cb25e53fbd037177f52e3a6d
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 18512 bytes
SHA-256: baff94a510517d37f85587b69582d78dd6e5af979964cd3c60dd4d9bd0c11f32

Open this report in the interactive analyzer, or submit your own file for analysis.