Malicious PDF — malware analysis report

Static analysis result for SHA-256 5414c9ff6b68093c…

MALICIOUS

PDF

121.6 KB Created: 2021-08-08 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7491718d428553c33fdaf6495a579525 SHA-1: 8e62fb9b0988a0f9b1fb4bcb90a61f22233e0790 SHA-256: 5414c9ff6b68093cabbbce568af4a28e97bbc337d17c49ac24ad26826b991a5f
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports this, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://benardoutlite.com/admin/fckeditor/fckdata/file/nizowonuruw.pdf In PDF document text
    • http://daming-school.com/userfiles/file/lixadumutuju.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/50075896182.pdfIn PDF document text
    • http://ndt-ultratech.com/files/legizifaguwaxomebipurugo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d97786ca4---resisavapidafebofadisoz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e448b2ec099---ninutivewobipexawon.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/62576333507.pdfIn PDF document text
    • http://apvn.info/userfiles/file/62431790427.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/suketulu.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/terujixobezugojirot.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/29888830729.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e2fccd227ddba37a42dba85a5ab5505/voboje.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/dokakurapa.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/11321090709.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/55307054504.pdfIn PDF document text
    • http://oodow.cn/upload/file/210623214904632165wzb127v5fovb.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/rarowisolugug.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/70377177066.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/wobemitizisuvo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jewijofanowawone.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kaseboregekumorivadez.pdfIn PDF document text
    • http://immopolignano.lu/images/fexepisovemekunamudux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lg+v20+android+9+xdaPDF 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_off0001783d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19054 10512 bytes
SHA-256: 9b108a93f02f399438a8e29ee901983a2db2201060a9924da48585f9392152cd
font_02_sfnt_off0001a831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A831 18540 bytes
SHA-256: e09ef6f96e267360a91bea1e621191ffef5294c6e199e0b53dca29bc05a76ed5

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