Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c42cc071577b8d…

MALICIOUS

PDF

82.2 KB Created: 2021-08-30 12:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fe92475b96430d8d6a965722cd7e138 SHA-1: d95a51afdc7d590aa23f26f9c8b54886ed6322b2 SHA-256: f2c42cc071577b8d5fdbbb36a562757433289b47716b1dd8be4f19458fb983d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=guy+names+with+s PDF link annotation
    • https://pielinks.com/UserFiles/file/jagovarulufuruxe.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/21970858635.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22e95385d---86683749910.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf8f7277980adf7e4a46f88efb1a3d6d/gurulipasegulovazatapeg.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/6099113633.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a06fae06e---35542084698.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/87804349092.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/27697334479.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ueohjm3admtov988p8d7sedqh5/sanasumoxubolelukigewaboj.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/24278783881.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160997d318a903---deweviwewogabidapiwigu.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zidegubibirobi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/50630790449.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/8048956027.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nifavasuxetima.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/kaxefonosorurapeka.pdfIn PDF document text
    • http://kasargod.net/uploads/file/23585479608.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823816e64a1---32871285227.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/44158228030.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/96047644803.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1da43e438---zesamemubuna.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d50583ca575536c0a0d3ee5ba46617b/4558656125.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cae7d0c116---35547432099.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa751aaf95205be80561d8d9cb46d03b/26119024316.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kr35jotqk8bg6pa8hl437hcfr6/lefiw.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/fawobewina.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/mizugusiwelojuwufadipo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/fokajiraxopijanejesazet.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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 17508 bytes
SHA-256: ce055de3a60731d000759a721dae41cb8a720dfe2a5f53c1dd2163ac25fc6d76
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10448 bytes
SHA-256: d74336ddac9b8e61f6324d839c7db3bdd7232836304757f0fe162d40bc753346
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1