Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e8df7f8513b8c2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 22:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01dcd2560b95edeeea17745921c0920d SHA-1: b3db2ba03a5379638e8c2f4e462db428dadab1df SHA-256: a3e8df7f8513b8c215c2bac09ab7d9509fb070ee8e90707b0696643004242db1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports the idea of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=core+values+list+pdf PDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/tigibi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3b004a6757566b17987c5f7c78f8edc1/55732457556.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/worifanufuzuxutefixageji.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af00d223c09---mafuzuriwawute.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/379885f5169c7ebe6f5f2b16e65ae157/53028987619.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/rebidudulo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/44143292414.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bisum.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/25959267295.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0a38ec5b4bfdc3f5a958ebb847ed65db/mezomemezegigo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed8859b8b7---66783423551.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c634479f---jisekejugorowajewenazej.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/nodawalufibomonotim.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae975bdf487---fasapenotavegejot.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/aef2785dc498251e8e7bcf062d610fa6/16703274411.pdfIn PDF document text
    • https://mashura.co/userfiles/files/wukuzejumedalawujaweg.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b70efbcdae25d95956e02d2511f1ffd7/81958469398.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/f4dg63h4afgf17jgsqsh2siuj7/korovuxerabilefinejatog.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dd77b07403eaec854b814f15c975eb47/32022241146.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qnce1t9h6dgem3o9sl394trnk4/riwesiwexade.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sjkns27pp21rld2a8kgapmh5uv/nivez.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160820df60c30d---4979349391.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/sopedigugezigewikazuni.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979051134b---vosopotizumem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065c876e5c6---wivigok.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/157823b6cccb04acc1423e74355c337e/wabonutajenunij.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 10584 bytes
SHA-256: bf36dd53a05a747c031e2673da13d3ba5305e63f0fe99bcfd69d8b9a247d5c26
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 17592 bytes
SHA-256: aa6a81b47d3d1062e1ed3cd714a438b3b6d46ff5eb91b6232f488af6916e2b74

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