Malicious PDF — malware analysis report

Static analysis result for SHA-256 35239ef603d7fac0…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 22:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03862db69ee4916316f0316cade50bfe SHA-1: d1eed6d36235f2f8f77d5d6f7dd7fb486afd4f5b SHA-256: 35239ef603d7fac0585b9e1e042d130dccad7f7644ed29e010480b8b072d60df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple disposable domains and compromised WordPress upload storage, likely intended to host phishing content. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=cesare+pavese+la+casa+in+collina+pdf PDF link annotation
    • http://adabaskimerkezi.com/upload/file/36890647068.pdfIn PDF document text
    • http://xenangheli.vn/public/files/vifisuwunovivatumebapubil.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9c44e8b1---femojoni.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac480450064---rulosimerilebopiwu.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/82158901090.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062709505078539.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1f1c75c8f67bea8c785aff9544959061/87481375902.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c539ac288c---65556450190.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/josibevibutopupikixujavux.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/11038892879.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dadamisajesukaxisusuli.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/46717260798.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/nonupupune.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/68176852177.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/fuxipetilowowamisivefam.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92570b0f03---87840623237.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/af98316b0f4557da9a119fc72b7f0059/21831240787.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160718df24091a---514784717.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/41112910705.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/saxomanefulubog.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210613_083831.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/pabaleruzadururite.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/10162700310.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/javinafejubid.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 20364 bytes
SHA-256: a8bc14223245e99220daf35a806a02b41970eaa41b83fa17bc2bdb39edad0616
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 10612 bytes
SHA-256: 0e4a3afd464bf07ae28ad88dbd2bd35715389671bfa85f94e075b8bbc685d65c