Malicious PDF — malware analysis report

Static analysis result for SHA-256 599c0862e5feafce…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 13:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 491fe635b0b7552f3f3d72b7fb6ca0a4 SHA-1: cda0ff6ff152095719c9b2a23498b66e0a6f797d SHA-256: 599c0862e5feafce112efe094c1a4c5b348867f178ef2be6d2ef643a9fd0cf23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pmapmc.com/userfiles/image/files/gubotuf.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d784cd9d23---49871864143.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/68478008427.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/64018012999.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wujakuvatizugivubilov.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/95787893732.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/faxogoliwokevi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/2333062359.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/be16d877f4d4c830a5cbb4afaf01549d/zobixalovewares.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/11314002684.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tanunoj.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/xinomesoxebema.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/dodabujelotalagas.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/62310877524.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82255086362.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/vuravazop.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/6184686438.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/36643634393.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ef1593e1---15966621851.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b116c7f92---15592575922.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109091116413658.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/pilaxemit.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zufewajejewovofewagisu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/55232550114.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xolonezotimode.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/dokakiparenema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=firestick+live+tv+appPDF 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_off0000c355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC355 10280 bytes
SHA-256: 8af0062a7f05aec9040f8de790f6afba7b2f171f2fdf3477f10fdda5e3d194d9
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 16604 bytes
SHA-256: 4bdd790483e9d13253dd913932f8512ddd8d59b28283ae18d46c7a0fcf3aaf05

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