Malicious PDF — malware analysis report

Static analysis result for SHA-256 28325af9ab382f86…

MALICIOUS

PDF

67.5 KB Created: 2021-09-01 10:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b529b52b639adba20a250c07fab153b8 SHA-1: 2494b203a9c614684e20bc22ceb023bf365386d8 SHA-256: 28325af9ab382f8679581754804d110e3cc457f145acc3378fdeb79466f5643e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2c2ca118---fubigisodagok.pdf In PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/popadabonagumikapevuv.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172131517761.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa45576dc0d---mawufu.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/3358980202.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kqprnmjm8hhe8b62u7jqm20v5s/59710714573.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/43cd5d9866c4ec2077f49f9eb76db7d9/nafepetaxebukaleges.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/piramofi.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/logol.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/8213704941.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lenetanuzaxeburativen.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ba67a91b---nuzewafanekipisum.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/96060000927.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9ae9c26---kegoku.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6eacd9---xegurudowagazepul.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210716190057_4m7d67.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607813562d066---3737838126.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1f52a27e---xelajekirakatawowi.pdfIn PDF document text
    • http://rs-entp.com/upload/file/86224080636.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/186c5c04a1d9df59a72a261e05f5f8b3/govanijatuwe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tavurinaduxozagitenozaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tails+dog+groomingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE67 14572 bytes
SHA-256: 28f50395f8fa2846eb4aaf05158cd2a829b0d67cbd06f92e77b0eb347a8cd94b
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10324 bytes
SHA-256: ce3d39546f29744b3ad3bcbca137e49866eff2000649ad449218514ec3748ed0
font_02_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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