Malicious PDF — malware analysis report

Static analysis result for SHA-256 865ec8e882f61411…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 22:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3cb1de665fe207f4bacfd622a9e106c SHA-1: 2dbc400cdfa07d82d0cf0a8316efade11fe119c6 SHA-256: 865ec8e882f61411e1eb91af368d9e6ddd1492590ff02f1075b9ac490eddeace
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malware. The presence of a visual download button lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://profix.fr/ckfinder/userfiles/files/totixexawurifapirufozurar.pdf In PDF document text
    • http://morethancars.nl/uploads/edytor/file/83169085089.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4602d9e4---kobijerowevawofogulasupop.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/45616673516.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612983a8cf684---10363118601.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a4f19878---85445643564.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/didevusevoru.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e0239ef6a---gojiwuxubutid.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a13a291127---83412541297.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tugidudeg.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/reduliponadutefakik.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210829_37340704AA399DFC.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u373calqh3emg4119ig6r04361/siripijajamefibawut.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tufanukubabebewebofog.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/lijezimavoketeve.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wamazaje.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d2e062584e0568a6b91a652d7034b9cd/sepomawofuwibu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/99aaf2e917379dfafc69916b1d1e7960/jolanajubitivafufezozizu.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/gavebumexuxuwimomumiluxi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611deb152d544---26282710431.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tosapilonibit.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0f2f6c27eaa5df98f8e7aaa4f9dade10/dekogowelinoxajupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=morphy+richards+microwave+am925efp+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f2ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2EA 17848 bytes
SHA-256: d05810bd904539f41fa038c59e6d6a4ae5719f5ad03779876cd0d75e460da9f9
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 17012 bytes
SHA-256: 152c1e9d5033b05af5f703729631cec47ffb43b8ef5aea2d929d573f2fe08ce1
font_02_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 11568 bytes
SHA-256: b901878d8e5b69f6286bfc762fe2ec86e30c3c136f11640c258ea98604105b3f