Malicious PDF — malware analysis report

Static analysis result for SHA-256 64560dcc479105d9…

MALICIOUS

PDF

95.9 KB Created: 2021-07-25 09:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 386a4794b4435bbc9b80c8adf138923d SHA-1: 362e3db4d70bf41f714c5d654ffdbafe15981b82 SHA-256: 64560dcc479105d9b30d66900261c8616491b040ea41a1a0c918737d5b4591b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to external URLs, several of which are hosted on potentially compromised CMS upload directories. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gzmzwl.com/Uploadfiles/files/13637367825.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e147e595ddfd59fb4f1587e8f283a9c9/19918833079.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/retuwutagupufolub.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/415a81a5072cc8f059656921376a8473/42794357131.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afed814d6de---wedevopizegijufogekegu.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210616152046335754xpn5acglbywa.pdfIn PDF document text
    • http://cy2hand.com/userfiles/89614045790.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/pagumimezolitujalimi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nojabowitapepemeti.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/zuwisobapuba.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d946e7fb---51511777194.pdfIn PDF document text
    • http://www.bash.cl/media/file/losefujadaravukoru.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dca4a57b01---96550658714.pdfIn PDF document text
    • http://skomi.ru/img/files/file/32807247208.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/73485827762.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oue2nnju2m8h03qlbcmr3b769p/vegebexegu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/34921873066.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/fimoda.pdfIn PDF document text
    • https://diphong.com/uploads/fezirope.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xaduludavuxeporujosabimew.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/7473982537.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/dizaredafodirilezome.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/5031657542.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d8fb9e5d7538e8296d906f33b82dcd5b/61302734779.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/19232267117.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/56694933870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+type+special+characters+on+a+chromebookPDF 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_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 26856 bytes
SHA-256: 83c1da2abf05d5eb517b8411116a22be8bc6fc17ac9fab49b27bcf48e7d8c856
font_01_sfnt_off00013c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 11304 bytes
SHA-256: d77a1d2c6e7dd42584e99e814877dacc55e642553a959832e8e89ff6a1b38663

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